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Industrial Safety Equipment & PPE — ANSI/OSHA Compliant
Industrial Safety Equipment & PPE — ANSI/OSHA Compliant

Howard Leight Laser Lite Review: NRR 32 Foam

Howard Leight Laser Lite Review: NRR 32 Foam — the short answer

Short answer: this howard leight laser lite review covers cordless polyurethane foam plugs at NRR 32 - among the highest label ratings any earplug carries, on the gentler 50 percent NIOSH tier because it is genuinely formable foam. The reviewed listing is live here; plan the exposure on the derated figure, not on NRR 32. Everything in this family is used under OSHA 29 CFR 1910.95, which means a hearing conservation program once the 85 dBA action level is reached: noise monitoring, a baseline and then annual audiograms, a real choice of protectors at no cost, and annual training.

NRR 32 | Polyurethane Foam | T-Shape | Uncorded | 200-Pair Dispenser Box

Howard Leight Laser Lite LL-1 Foam Earplugs NRR 32 200 Pairs Review (2026)

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If your noise-control toolbox has room for only one uncorded foam earplug, the Howard Leight Laser Lite LL-1 deserves serious consideration. With a Noise Reduction Rating of 32 decibels — one of the highest commercially available for disposable foam — it sits at the very top of the disposable-earplug performance tier. The 200-pair dispenser box keeps per-pair cost low enough for high-turnover industrial programs while ensuring workers always reach for a fresh pair rather than re-using one past its effective life.

This review pulls specs directly from Howard Leight's published product data and tests them against the requirements of OSHA's hearing conservation program (29 CFR 1910.95) and the ANSI S3.19 standard used to determine the NRR. It does not rely on fabricated attenuation numbers, invented testimonials, or unverified marketing language.

The Laser Lite's signature is its T-shaped, tapered body and ultra-soft low-pressure polyurethane foam. The T-profile gives wearers a natural grip point for rolling and insertion without contaminating the foam portion, which matters on dirty job sites. The bright pink and yellow coloration is functional, not cosmetic: it satisfies the visual check requirement many safety programs impose — a supervisor can confirm ear protection is in place across the floor with a glance. Together, these features have made the Laser Lite a mainstay in high-decibel industrial hearing protection for two decades.

Verdict

4.6 / 5
★★★★☆

The Howard Leight Laser Lite LL-1 is a best-in-class disposable foam earplug for noisy industrial environments. Its NRR 32 rating, bright visual-compliance color, and 200-pair economy pack make it the rational default choice for hearing-conservation program administrators who need proven attenuation without per-pair budget pressure.

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✓ Pros

  • NRR 32 — top tier for disposable foam earplugs
  • T-shaped body for clean, controlled insertion
  • Ultra-soft low-pressure foam reduces long-shift fatigue
  • Bright pink/yellow colorway enables visual compliance checks
  • 200-pair dispenser box lowers per-pair cost significantly
  • ANSI S3.19 tested and certified
  • No cords to snag machinery or become contaminated
  • Fits most adults; widely compatible ear canal size range

✗ Cons

  • Single-use only — not designed for washing and reuse
  • Proper roll-down and hold technique required for rated NRR
  • No cord option in this SKU (LL-30 is the corded variant)
  • Not optimal for workers with narrow or small ear canals without individual fit check
  • Fit technique training is mandatory; dispenser access alone is insufficient

Who This Earplug Is For

The Howard Leight Laser Lite LL-1 is engineered for high-noise industrial environments where workers need maximum disposable-foam attenuation, consistent compliance visibility, and low per-day cost. The 200-pair box format targets safety managers running formal hearing conservation programs under OSHA 29 CFR 1910.95, manufacturing facilities, construction contractors, airport ground crews, and anyone exposed to time-weighted average (TWA) noise levels above 85 dB(A) who requires the top tier of disposable protection.

It is also a legitimate choice for recreational shooters, live concert staff, and power-tool users who want authoritative attenuation rather than commodity foam plugs. The best foam earplugs for high-decibel occupational use must deliver consistent, measurable protection — the Laser Lite's T-shape and low-pressure expansion make a repeatable fit accessible to workers across a range of ear canal geometries. For those comparing foam plug options broadly, see WC Safety's best earplugs for work guide.

Strengths in Detail

NRR 32: Maximum-Tier Disposable Attenuation

The Noise Reduction Rating (NRR) of 32 dB is measured under ANSI S3.19 laboratory conditions using trained panelists. In occupational applications, OSHA directs safety professionals to apply a derating factor when using the NRR to estimate real-world attenuation. Using the OSHA Appendix B formula — (NRR − 7) ÷ 2 — the LL-1 yields an estimated 12.5 dB of TWA reduction in field conditions. Using NIOSH's 50% derating (NRR × 0.50), the estimate is 16 dB. Either figure is among the highest attainable from a single disposable protector, positioning the LL-1 as an appropriate choice for TWA exposures up to roughly 102–105 dB(A) before dual hearing protection is indicated. For a detailed walkthrough of each formula, see WC Safety's complete NRR hearing protection guide.

T-Shape Design: Ergonomic Insertion and Compliance

Most foam earplugs are cylindrical or bell-shaped. The Laser Lite's T-profile — a wider flange at the outer end narrowing to a tapered foam cylinder — gives the user a natural pinch point for rolling without touching the insertion end. This reduces foam contamination on worksites where hands are oily, dusty, or otherwise soiled. It also speeds up insertion time, which matters in break-room dispensing scenarios where dozens of workers are donning earplugs at shift change. Safety trainers consistently note fewer incorrect-insertion incidents with T-shaped plugs compared to plain cylindrical designs, because the geometry physically guides the user's fingers away from the foam tip.

Ultra-Soft Low-Pressure Polyurethane Foam

Howard Leight formulates the Laser Lite's foam to expand slowly and exert minimal outward pressure once seated. Long-shift comfort is a real compliance driver: workers who experience ear canal pain or headaches from high-pressure plugs will roll plugs incompletely, insert them shallowly, or remove them during peak-noise tasks. The Laser Lite's low-pressure formulation reduces these behaviors, sustaining the protection the NRR predicts over an eight- or twelve-hour shift. Comfort-driven compliance is one of the most under-documented variables in occupational hearing conservation program effectiveness — an earplug worn correctly all shift delivers far more real protection than a higher-NRR plug worn incorrectly or intermittently.

Bright Colorway: Supervisor Visual Checks

The pink body and yellow tip make the LL-1 highly visible against skin tones, hard-hat interiors, and workwear across all lighting conditions typically encountered on industrial floors. OSHA's hearing conservation standard (29 CFR 1910.95(i)(3)) requires employers to train employees on the purpose of hearing protectors and instruct on proper use — visual compliance checks by supervisors are a common implementation of ongoing program monitoring. The Laser Lite's high-contrast colorway makes these checks practical without requiring workers to stop tasks or remove plugs for inspection. This is a functional design advantage absent from beige or skin-tone earplugs that are nearly invisible at distance or in low light. For a broader look at hearing protection selection criteria, see WC Safety's hearing protection guide.

200-Pair Dispenser Box: Program Economics

Hearing conservation programs sized for 50–500 workers consume earplugs at scale. A 200-pair box yields a per-pair cost well below individually packaged alternatives while providing a self-dispensing format that can be wall-mounted at facility entrances, machine-room doors, or break rooms. One standard recommendation for single-use earplugs is one new pair per shift per worker. A 200-pair box covers 200 worker-shifts. For a 40-person facility on daily shifts, a single box covers approximately five workdays — a predictable ordering cycle that simplifies procurement. The dispenser format also reduces loose-pair scatter and the hygiene concerns that come with unwrapped earplugs stored in pockets or shared toolboxes.

Weaknesses and Limitations

Single-Use Only

The LL-1 is a disposable earplug. Polyurethane foam degrades quickly when rolled, compressed, and exposed to ear canal oils and moisture; reusing a pair past one shift reduces both comfort and attenuation. Programs that wash and reuse foam earplugs void the NRR certification. If per-pair reuse over multiple days is a program requirement, a corded washable foam earplug or a triple-flange reusable plug is a better fit. See WC Safety's reusable vs. disposable earplugs guide for a full head-to-head comparison of both categories.

Proper Fit Technique Is Non-Negotiable

Every foam earplug's NRR is contingent on correct roll-down, insertion, and hold technique. A Laser Lite inserted incorrectly — not rolled thin enough, not inserted deep enough, or not held long enough for the foam to expand — can deliver drastically less than rated attenuation. OSHA 29 CFR 1910.95(i)(5) requires training on use, care, and limitations of hearing protectors. Bulk dispenser access alone does not constitute compliance with that training requirement. First-time users and employees new to hearing protection programs need hands-on demonstration from a qualified trainer, not just dispenser-box availability.

No Cord: Lost-Plug Risk in Certain Environments

The LL-1 is uncorded. Uncorded plugs are the correct choice for most fixed-workstation environments, but workers who repeatedly don and doff hearing protection — entering and exiting machine enclosures, for example — or who work near conveyor systems where a dropped earplug creates contamination risk, may benefit from a corded version. Howard Leight's LL-30 provides the same Laser Lite foam in a corded configuration. Uncorded plugs also mean a dropped plug is a discarded plug; high-doff-rate environments should factor that waste into per-plug economics when comparing the LL-1 against the LL-30.

Single Size: Ear Canal Variability

The LL-1 ships in one size. Howard Leight's published fit guidance indicates the plug is appropriate for most adults, but workers with small or unusually narrow ear canals may find the fully-expanded plug does not seat at sufficient depth for maximum attenuation. Employers serving a diverse workforce or encountering fit complaints should conduct individual fit testing and maintain alternative protectors — smaller plug form factors or canal caps — as options within the hearing conservation program inventory.

Competitor Comparison

Product NRR Shape Material Pairs/Box Corded? Price Check
Howard Leight Laser Lite LL-1 32 T-shape PU Foam 200 No Amazon
Howard Leight MAX-1 33 Bell/cylindrical PU Foam 200 No Amazon
3M E-A-R Classic (1100) 29 Cylindrical PU Foam 200 No Amazon
Moldex Pura-Fit 6800 33 Tapered cylinder PU Foam 200 No Amazon
Howard Leight LL-30 (corded) 32 T-shape PU Foam 100 Yes Amazon

NRR values cited from each manufacturer's published ANSI S3.19 data sheets. The LL-1's NRR 32 is competitive but not unique — MAX-1 and Pura-Fit match or exceed it by one point. The Laser Lite differentiates on T-shape ergonomics and low-pressure foam comfort, not raw NRR alone. For a broader earplug comparison across industrial use cases, see WC Safety's earplug guide.

Howard Leight Laser Lite Series: Which Variant Is Right for Your Program?

The Laser Lite family extends beyond the LL-1 uncorded 200-pair box. Selecting the right variant depends on your dispensing model, work environment, and doff frequency:

  • LL-1 (this SKU) — 200-pair dispenser box, uncorded. Best for high-volume programs with wall-mount dispensers where workers stay at workstations.
  • LL-30 — Same NRR 32 Laser Lite foam, corded. Best for workers who doff frequently, move between noise zones, or work near moving machinery where a dropped plug is a hazard.
  • LL-1-OSFV / LL-1-OSFVR — Individually-wrapped pairs with NRR 32. Best for visitor kits, tool cribs, and programs that need per-pair accountability or sterile packaging for client-facing or food-processing environments.

All Laser Lite variants share the same NRR 32 polyurethane foam compound. The dispenser format and cord option are the only differentiators. If volume dispensing fits your operation, the LL-1 is the most economical entry in the family.

Compatible Accessories and Companion Products

The Laser Lite LL-1 works as a standalone protector for most occupational exposures. Program administrators commonly pair it with:

  • Dispenser brackets — Wall-mount brackets for 200-pair boxes allow placement at facility entrances, on machine panels, or in break rooms. Howard Leight and compatible third-party suppliers manufacture brackets that accept the standard 200-pair box form factor.
  • Earmuffs for dual protection — For TWA exposures exceeding approximately 105 dB(A), OSHA guidance and 29 CFR 1910.95 Appendix B recommend combining earplugs with earmuffs. The LL-1 is fully compatible with earmuffs worn over it. See WC Safety's hearing protection collection for earmuff options.
  • Fit-test systems — Quantitative fit-testing equipment compliant with ANSI/ASA S12.71 measures real-world Personal Attenuation Rating (PAR) for individual workers, replacing the derated NRR estimate with actual measured field data. This is the gold standard for high-exposure environments.
  • PPE program supplies — Browse WC Safety's full PPE collection for complementary safety equipment including eye protection, head protection, and respiratory PPE.

OSHA and ANSI Standards Context

The Laser Lite LL-1's NRR of 32 is certified under ANSI S3.19, the laboratory-based hearing protector measurement standard used by U.S. manufacturers for FTC-required NRR labeling. Understanding what this means for your compliance program is essential:

  • OSHA 29 CFR 1910.95 governs occupational noise exposure in general industry. Employers whose workers are exposed to a TWA at or above 85 dB(A) — the Action Level — must implement a hearing conservation program that includes exposure monitoring, audiometric testing, protector provision, training, and recordkeeping.
  • Estimated real-world attenuation: OSHA Method (Appendix B): (NRR − 7) ÷ 2 = (32 − 7) ÷ 2 = 12.5 dB. NIOSH 50% derating: 32 × 0.50 = 16 dB. Individual fit testing (ANSI/ASA S12.71) is the only method that produces a measured Personal Attenuation Rating for a specific worker.
  • Adequacy check: Under OSHA's Appendix B, attenuated exposure (TWA minus estimated attenuation) must fall at or below 90 dB(A) for the general industry criterion. Using 12.5 dB OSHA-method attenuation, the LL-1 is adequate for TWA exposures up to approximately 102.5 dB(A). For TWA exposures above that level, dual protection (LL-1 + earmuff) is indicated.
  • Annual training on correct insertion is mandated under 29 CFR 1910.95(i). Dispenser availability does not substitute for documented hands-on training for all at-risk employees.

For a step-by-step framework, see WC Safety's Hearing Conservation Program Guide. For formula breakdowns, see the NRR guide.

Total Cost of Ownership

The 200-pair dispenser box is the cost-optimization vehicle for high-volume programs. When evaluating TCO against a reusable earplug program:

Cost Factor LL-1 Disposable (200-pair box) Reusable Triple-Flange (per pair)
Per-pair acquisition cost Low (bulk box economy) Higher per unit
Reuse cycles 1 (single-use by design) Multiple (with proper cleaning)
Training complexity Roll-down technique required; moderate Push-to-fit; often simpler
Hygiene risk None (fresh pair each shift) Requires enforced cleaning protocol
Compliance visibility High (bright pink/yellow) Variable by product color
Lost/soiled replacement cost Fraction of a cent per pair Full per-pair replacement cost
Waste/environmental footprint Higher (one pair per shift) Lower (multi-use per pair)

For environments where workers move between clean and dirty tasks, or where daily sanitization of reusable plugs cannot be reliably enforced, the LL-1's single-use model eliminates one hygiene compliance variable entirely. The reusable vs. disposable earplug guide walks through the full decision logic.

NRR 32 on the Laser Lite LL-1 — and the two numbers that replace it

The rating on the packet is an EPA label figure measured under ANSI S3.19 in a laboratory, on trained subjects, with a perfect fit. Two standard corrections bring it back to what a real shift looks like.

OSHA 29 CFR 1910.95: (32 − 7) ÷ 2 = 12.5 dB
NIOSH: this plug is derated 50%, leaving about 16 dB

Which NIOSH tier applies depends on the material, not the shape. NIOSH derates earmuffs 25%, formable foam earplugs 50%, and every other earplug type 70%. This one is described by the manufacturer as cordless single-use polyurethane foam plugs. It is formable polyurethane foam, so the 50% tier applies.

  • A plug that is not seated is not protecting you, and it looks fine. That is the reason NIOSH is harder on plugs than on muffs: a half-inserted plug is invisible, while a lifted muff cushion is obvious within a minute.
  • Roll, insert, hold. Foam needs to be compressed thin, inserted deep, and held while it expands. A flanged plug needs the ear canal straightened and the flanges pushed past the first bend. Neither works if you rush it.
  • Fit training beats a higher number. The gap between the label and the derated figure is entirely about fit, so an hour of training moves real protection further than two points of NRR ever will.

Fit beats rating, every time

A foam earplug only works if it is rolled down thin, inserted deep enough, and held while it expands. A plug resting in the outer ear can deliver a small fraction of its rating — the difference between a good and a poor insertion is far larger than the difference between an NRR 27 plug and an NRR 33 one.

  • Roll the whole plug into a thin crease-free cylinder, do not just pinch the tip.
  • Pull the ear up and back with the opposite hand to straighten the canal before inserting.
  • Hold for the full expansion time — releasing early is the commonest error, and the plug backs out as it expands.
  • Check it. With plugs seated correctly, your own voice sounds hollow and muffled. If it sounds normal, they are not in.

Where a program needs evidence rather than technique, fit testing for hearing protection exists and produces a measured personal attenuation rating for the individual — the hearing equivalent of a respirator fit test, and far more informative than any label.

Related hearing protection

Foam and reusable plugs sit under corded ear plugs, within the wider hearing protection range. Where plugs cannot be worn — ear infections, frequent on-off cycles, or a workforce that will not insert them consistently — ear muffs are the more reliable choice because their fit is far less technique-dependent. For intermittent noise where hearing speech between exposures matters, see banded ear plugs.

What using one of these legally requires

An earplug is not a compliance strategy on its own. Where noise exposure reaches the action level, OSHA 29 CFR 1910.95 requires a hearing conservation program, and the protector is one part of it:

  • The action level is an 8-hour TWA of 85 dBA. At or above it the employer must run the program. The permissible exposure limit is 90 dBA as an 8-hour TWA, on a 5 dB exchange rate — so 95 dBA is a 4-hour exposure and 100 dBA a two-hour one. NIOSH recommends a lower 85 dBA limit on a 3 dB exchange.
  • Monitoring comes first. A noise survey establishes who is exposed and to what. Choosing a protector by its rating without knowing the level it has to bring down is guesswork in both directions.
  • Audiometric testing. A baseline audiogram within six months of first exposure, then annually. That test — not the number on the packet — is the evidence that the program is working.
  • Protectors provided at no cost, with a real choice. Employees must be able to select from a variety of suitable protectors, and be trained in fitting, care and use. Attenuation has to be adequate for the actual exposure.
  • Training annually, and records kept. Exposure measurements and audiometric records are retained; training is repeated every year.

Two limits apply regardless of the model. Hearing protection sits at the bottom of the hierarchy of controls — where feasible engineering or administrative controls can bring exposure down, they are required, and a plug is not a substitute for them. And a rating is a laboratory ceiling reached only with a correct fit, which is why fit and training move the outcome more than a higher number on the box.

Why trust WC Safety

WC Safety is an independent, affiliate-supported review site. We hold no inventory, sell nothing directly, and earn only from qualifying purchases made through clearly marked links — which never changes what a hearing protector is rated to do. This review is compiled by Steven Eaton from the manufacturer’s published listing, the EPA-labeled Noise Reduction Rating that appears on the packaging, and the text of OSHA 29 CFR 1910.95 and the NIOSH hearing-loss prevention criteria. We hold no laboratory, run no attenuation testing, and publish no customer-rating aggregate, because we have no customers to aggregate. Where the published record disagrees with itself, we say so rather than pick a figure.

Our methodology

Specifications come from the live listing and its variant record; standards language comes from OSHA 29 CFR 1910.95 and the NIOSH criteria directly. The NRR is reported as the manufacturer publishes it and then derated by a stated method — OSHA’s (NRR − 7) ÷ 2, or the NIOSH percentage for the device type — never presented as the protection a wearer receives. The score is an editorial judgment of specification, fit type and value: not a measured result, not an attenuation test, and not an average of user ratings.

Related hearing protection

Foam and reusable plugs sit under corded ear plugs, within the wider hearing protection range. Where plugs cannot be worn — ear infections, frequent on-off cycles, or a workforce that will not insert them consistently — ear muffs are the more reliable choice because their fit is far less technique-dependent. For intermittent noise where hearing speech between exposures matters, see banded ear plugs.

Researched and written by Steven Eaton, editor of WC Safety. Steven holds no safety certification and does not test products; this page compares what manufacturers publish, with the gaps in that record marked. Last reviewed July 2026.

More questions on this topic

What is the NRR of the Howard Leight Laser Lite LL-1?

The Laser Lite LL-1 has an NRR (Noise Reduction Rating) of 32 dB, measured under ANSI S3.19 laboratory conditions. This is one of the highest NRR values available for a disposable foam earplug and places it in the maximum-attenuation tier for uncorded disposables.

How does NRR 32 translate to real-world noise reduction?

Using the OSHA field-use formula from 29 CFR 1910.95 Appendix B — (NRR − 7) ÷ 2 — the LL-1 provides an estimated 12.5 dB of TWA reduction in field conditions. Using NIOSH's 50% derating (NRR × 0.50), the estimate is 16 dB. Individual fit testing establishes your actual Personal Attenuation Rating. See WC Safety's NRR guide for the full formula walkthrough and comparison of derating methods.

Is the LL-1 OSHA compliant?

The LL-1's NRR is certified under ANSI S3.19, the measurement standard referenced by OSHA 29 CFR 1910.95. Whether it is adequate for your specific noise exposure requires a TWA measurement and adequacy calculation. The earplug itself is standards-compliant; program compliance additionally requires documented training, audiometric testing, exposure monitoring, and recordkeeping under 29 CFR 1910.95.

Can I reuse the Laser Lite LL-1 earplugs?

No. The LL-1 is designed as a single-use disposable earplug. Reusing foam earplugs degrades attenuation — compressed, soiled foam no longer expands fully or seals the ear canal — creates a hygiene risk, and voids the NRR certification. For multi-use programs, consider a washable corded foam plug or a triple-flange reusable design. See WC Safety's reusable vs. disposable earplug guide.

How do I properly insert the Laser Lite LL-1?

Roll the plug between thumb and forefinger until it is thin and smooth with no creases. With your free hand, reach over your head and pull the top of your ear upward and back to open the ear canal. Insert the rolled plug with a gentle twisting motion until the tip is fully seated. Hold it in place with a fingertip for at least 30 seconds while the foam expands. A correctly inserted plug should feel snug and produce a noticeable reduction in ambient noise. If ambient sound is still clearly audible with one ear occluded, the plug is not fully seated.

What is the difference between the LL-1 and LL-30?

Both use the same NRR 32 Laser Lite polyurethane foam. The LL-1 is uncorded; the LL-30 adds a connecting cord. The cord makes the LL-30 convenient for workers who hang the plugs around their neck between noise exposures and reduces lost-plug risk near machinery. The LL-1's 200-pair box format is standard for dispenser programs; the LL-30 is common in environments with frequent donning and doffing cycles.

What noise levels is the Laser Lite LL-1 appropriate for?

Using the OSHA adequacy criterion (attenuated exposure at or below 90 dB(A)) and the OSHA derating formula, the LL-1 is adequate as a single protector for TWA exposures up to approximately 102.5 dB(A). For higher exposures, dual hearing protection — LL-1 earplugs combined with earmuffs — is indicated. The LL-1 is physically compatible with over-the-ear earmuff use.

How many pairs come in the LL-1 dispenser box?

The LL-1 in this SKU contains 200 pairs in a self-dispensing box designed for wall-mount bracket use. Howard Leight also offers Laser Lite plugs in individually wrapped pairs (LL-1-OSFV) for visitor programs and per-pair issue scenarios.

What material are the Laser Lite LL-1 earplugs made of?

The Laser Lite LL-1 is made from low-pressure polyurethane (PU) foam, engineered to expand slowly and exert minimal outward force after insertion. This formulation prioritizes long-shift comfort while maintaining the attenuation characteristics required for NRR 32 certification under ANSI S3.19.

What colors are the Laser Lite LL-1 earplugs?

The LL-1 features a pink body with a yellow tip. The high-contrast coloration serves a practical compliance function: supervisors can visually confirm from a distance that workers are wearing hearing protection without requiring workers to stop tasks or remove the plugs for inspection.

Do the Laser Lite LL-1 earplugs fit standard dispensing stations?

Yes. The 200-pair box is designed for wall-mount dispenser brackets. Howard Leight and compatible third-party vendors manufacture brackets that accept the standard 200-pair box form factor. Placing dispensers at facility entrances, machine-room doors, and break rooms increases accessible-use compliance rates compared to centralized storage.

How does the Laser Lite compare to the 3M 1100?

The 3M 1100 carries an NRR of 29 — three points below the Laser Lite LL-1's NRR 32. In OSHA-formula terms, that is approximately 1.5 dB less estimated real-world attenuation. Both are disposable, uncorded, polyurethane foam designs in 200-pair formats. The LL-1's T-shape provides a more ergonomic grip for rolling and insertion. For the highest single-earplug attenuation in a disposable uncorded foam format, the LL-1 outperforms the 3M 1100 on the NRR metric.

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