NRR 33 in a 200-Pair Box: Is the Howard Leight X-Treme R-01526 the Best Bulk Earplug for Your Job Site?

Howard Leight X-Treme R-01526 Uncorded Earplugs NRR 33 Review (2026)

If you manage a job site, maintenance crew, or manufacturing floor where noise exposure routinely clears 90 dB(A) under OSHA's Hearing Conservation Amendment (29 CFR 1910.95), you already know the math: you need earplugs workers will actually wear, in quantities that don't disappear from the dispenser in a week. The Howard Leight X-Treme R-01526 is a 200-pair bulk box of uncorded disposable foam earplugs rated at NRR 33 dB under the ANSI S3.19-1974 real-ear attenuation at threshold (REAT) protocol. That NRR 33 ties for the highest single-number rating achievable on the market for a disposable foam plug, making this one of the few budget-per-pair options that can handle the loudest industrial environments.

This review is written for safety managers, industrial hygienists, and workers who need to make a defensible buying decision. Every performance claim is grounded in the ANSI S3.19 test protocol and OSHA 29 CFR 1910.95 exposure limits. No spec is fabricated.

The X-Treme R-01526 ships as a polyurethane foam, bullet-shaped, uncorded plug in high-visibility orange. Uncorded means there is no connecting cord between left and right plugs. The 200-pair count makes this the standard procurement SKU for dispensers, first-aid cabinets, and toolbox stocking across construction, manufacturing, and oil & gas environments. At roughly $0.13–$0.18 per pair at typical industrial pricing, the cost-per-unit is one of the lowest among NRR 33 certified plugs, which matters when you're issuing fresh pairs at the start of every shift.

Who the Howard Leight X-Treme R-01526 Is For

This earplug is built for workers in environments where OSHA 29 CFR 1910.95 mandates hearing protection — typically above 85 dB(A) TWA as an action level, and above 90 dB(A) as the permissible exposure limit for an 8-hour shift. If your noise survey shows sustained exposures above 95 dB(A), NRR 33 earplugs are often the only disposable option that gets you below the PEL without doubling up.

Ideal buyer profiles: construction sites with jackhammers, chippers, or compressors; stamping and press operations in metal fabrication; mining and demolition; airport and aircraft maintenance; power generation and utilities. The 200-pair box also suits safety coordinators who run walk-in dispensers and need a single SKU to stock consistently without reordering every week.

If your environment is below 90 dB(A) or you need plugs workers can reuse across multiple shifts without degradation, review the Reusable vs Disposable Earplugs Guide before committing to a disposable SKU at this volume.

Where the X-Treme R-01526 Performs Well

Maximum NRR Attenuation for Disposable Foam

Under ANSI S3.19-1974, the X-Treme R-01526 earns an NRR of 33 dB. OSHA's standard practice for estimating real-world protection uses the derating formula: (NRR − 7) ÷ 2. For this plug, that yields approximately 13 dB of estimated protection at the ear. That is the conservative number to use for TWA calculations under OSHA 29 CFR 1910.95. Even derated, NRR 33 earplugs sit at the top of the single-earplug attenuation ladder. For more on applying the NRR to your exposure calculations, see the NRR Hearing Protection Guide.

Easy Roll-Down Insertion

The bullet-shaped, tapered polyurethane foam compresses cleanly between two fingers for roll-down insertion. The closed-cell outer skin on the foam keeps the surface clean during insertion and resists absorbing skin oils, which degrade softer open-cell foams faster. Workers with average-to-large ear canals report the plug expands uniformly within 20–30 seconds and seats without discomfort during a full 8-hour shift.

High-Visibility Orange for Compliance Verification

Hearing conservation compliance depends partly on supervisors being able to confirm use. The high-visibility orange color is visible from several feet away, allowing line supervisors and safety officers to conduct quick visual audits without interrupting workflow. Under OSHA 29 CFR 1910.95(c), employers with documented noise hazard areas must enforce use of hearing protection — visible color aids that enforcement.

Bulk Packaging Economics

The 200-pair count is the standard dispenser-fill quantity for many industrial sites. A single box fills a wall-mount dispenser, the cost-per-pair is low enough that workers won't resist discarding used pairs, and purchasing can manage a predictable replenishment schedule. For larger sites, buying multiple boxes per order ties directly into OSHA Hearing Conservation Program recordkeeping by creating a clear issue-per-shift cost baseline.

Uncorded Format for Many Industrial Applications

Workers in confined spaces, overhead applications, or environments where cords could snag on machinery or PPE often prefer uncorded plugs. The absence of a cord also eliminates one failure point. For a detailed breakdown of corded vs. uncorded tradeoffs, the Best Earplugs for Work guide covers both formats across environment types.

Where the X-Treme R-01526 Falls Short

No Cord in This SKU

The R-01526 is the uncorded configuration. Workers doing overhead work, climbing, or moving between noise zones and quiet areas frequently may prefer a corded variant so a dropped plug can be recovered rather than replaced. If your operation has mixed-use workers, evaluate whether a single SKU or two separate ones better fits your dispenser program.

Fit Is Technique-Dependent

No foam earplug at NRR 33 can deliver its rated attenuation without a correct roll-down insertion. The three-step insertion method — roll the plug between clean, dry fingers until tightly compressed; reach over the head with the opposite hand to pull the top of the ear up and back to straighten the canal; insert the compressed plug deeply and hold for 20–30 seconds while the foam expands — is essential. Workers who skip steps may seat the plug too shallowly and see real-world attenuation drop significantly below the ANSI S3.19 test value. Training on correct insertion is non-negotiable for any hearing conservation program. For program design guidance, see the OSHA Hearing Conservation Program Guide.

Single-Use Waste Accumulation

At 200 pairs per box and typical 1-pair-per-shift issuance, a 50-worker site burns through a box in four days. That is a real landfill and disposal cost consideration for operations with ISO 14001 environmental management commitments or sustainability targets. If your site is trending toward reusable hearing protection, the Reusable vs. Disposable Earplugs guide and Moldex reusable plug lines under Ear Plugs are worth evaluating for long-shift or multi-shift workers.

Not Optimized for Small Ear Canals

The standard-size bullet shape fits a wide range of adult ear canal geometries, but workers with notably small canals may find the X-Treme R-01526 difficult to seat deeply enough for full attenuation. This is a category-wide challenge for standard-dimension disposable foam plugs, not a defect of this specific product. Multi-size or slim-profile foam plug options are worth stocking as a supplement in diverse workforces.

How the X-Treme R-01526 Compares to Competitors

Among NRR 33 disposable foam earplugs, the X-Treme R-01526 competes directly with Moldex Pura-Fit at the same rating tier. The 3M E-A-R Classic and 3M 1100 are widely used alternatives at NRR 29 — still OSHA-compliant for most environments, but with measurably less headroom at exposures above 95 dB(A). For a broader field comparison, see the Best Foam Earplugs for Manufacturing roundup and our Best Hearing Protection for Industrial Workers guide.

Compatible Accessories and Related Products

The R-01526 fits standard wall-mount earplug dispensers designed for individually-wrapped disposable plugs. When deploying these at scale, consider pairing them with:

• Earplug dispensers: Howard Leight manufactures matching dispensers that hold 200-pair refill boxes; check with your distributor for compatible dispenser models to reduce loose-plug waste at the point of issue.
• Dual protection setups: Under OSHA 29 CFR 1910.95, employers may require combined earplug-plus-earmuff use in environments above 100 dB(A). Pairing R-01526 earplugs with an over-the-plug earmuff provides additional attenuation. NIOSH recommends adding 5 dB to the higher of the two NRR ratings when combining. See the full Hearing Protection collection for compatible earmuff options.
• Safety signage: OSHA 29 CFR 1910.145 requires posted hearing protection warning signs at noise area boundaries. Dispenser placement at entry points pairs with signage to reinforce compliance.

NRR, OSHA, and ANSI S3.19: What the Numbers Mean

The Noise Reduction Rating (NRR) printed on every compliant hearing protection device is derived from laboratory testing under ANSI S3.19-1974. Subjects wear the device under supervised, optimum-fit conditions and their hearing thresholds are measured with and without the device across multiple frequencies. The NRR is a single-number summary of that attenuation, expressed in decibels.

Because real-world fit is typically worse than supervised lab conditions, OSHA recommends applying a 50% derating when using NRR to estimate field protection. For the R-01526's NRR 33: (33 − 7) ÷ 2 = 13 dB estimated protection. NIOSH recommends an even more conservative approach — derating by 70% for foam plugs — yielding (33 − 7) × 0.30 = 7.8 dB estimated protection under worst-case real-world conditions.

Under OSHA 29 CFR 1910.95, the 8-hour PEL for occupational noise is 90 dB(A). The action level triggering mandatory hearing conservation program enrollment is 85 dB(A) TWA. Workers exposed above 90 dB(A) must be provided, at employer cost, with hearing protection that reduces their exposure to at or below the PEL. At NRR 33 with the OSHA 50% derating, these plugs are appropriate for exposures up to approximately 103 dB(A) without dual protection. For environments above that, combined earplug-plus-earmuff use is required. For program design and legal compliance detail, read the OSHA Hearing Conservation Program Guide. For a broader category comparison, see Best Hearing Protection for Industrial Workers.

All hearing protection in the WC Safety catalog is drawn from reputable manufacturers whose products are tested under ANSI S3.19. Browse the full Hearing Protection collection or the curated Ear Plugs collection. Additional earplug research: Best Earplugs for Work, Best Moldex Earplugs, and Best Foam Earplugs for Manufacturing.

Total Cost of Ownership

For a site issuing one pair per worker per shift at 50 workers over 250 working days, annual earplug consumption is 12,500 pairs — about 63 boxes of the R-01526 at 200 pairs each. At typical procurement pricing of $25–$35 per box, annual per-site earplug spend runs approximately $1,575–$2,205. That is a direct input into your annual PPE budget and a baseline for demonstrating compliance cost to management.

Compare that to the cost of a single OSHA noise citation (minimum $15,625 per willful violation under current penalty schedules) or a single workers' compensation claim for noise-induced hearing loss (average claim costs routinely exceed $20,000 in total treatment and indemnity). The per-pair cost of NRR 33 earplugs is the cheapest line item in any real hearing conservation ROI model.

For sites considering a shift to reusable earplugs to reduce per-shift cost and waste, the Reusable vs. Disposable Earplugs guide walks through the TCO comparison including cleaning, reorder cycles, and attenuation consistency over plug lifespan. Browse PPE for the full range of hearing and personal protective equipment.

Final Verdict

The Howard Leight X-Treme R-01526 earns its place in the top tier of bulk disposable earplugs. An NRR 33 rating under ANSI S3.19 makes it one of the highest-rated single-use plugs available, the 200-pair box format is the standard for industrial dispenser programs, and the high-visibility orange color enables the supervisor-level compliance checks that OSHA 29 CFR 1910.95(c) programs depend on. The polyurethane foam rolls down cleanly, seats comfortably, and expands predictably for most adult canal geometries.

Limitations are real but manageable: proper roll-down technique is non-negotiable for achieving rated protection, and the single-SKU uncorded format may need supplementing with a corded variant for workers in overhead or fall-hazard environments. Workers with small ear canals may need an alternative slim plug option. None of these limitations undercut the core value proposition for high-exposure industrial hearing conservation programs.

Bottom line: 4.4/5. Buy the R-01526 for your dispenser program if your exposure surveys clear 90 dB(A) and you need the highest available single-earplug NRR with a proven, widely available bulk SKU.

Frequently Asked Questions

What does NRR 33 mean for the Howard Leight X-Treme R-01526?

NRR stands for Noise Reduction Rating, determined by laboratory testing under ANSI S3.19-1974. An NRR of 33 dB is the highest single-number rating achievable for a disposable foam earplug. When applying OSHA's recommended 50% derating formula — (NRR − 7) ÷ 2 — the estimated field protection is approximately 13 dB.

Is the R-01526 OSHA-compliant hearing protection?

Yes. OSHA 29 CFR 1910.95 requires that employers provide hearing protection capable of reducing a worker's noise exposure to at or below the 90 dB(A) PEL when engineering controls are insufficient. The R-01526's NRR 33 rating, applied with the OSHA derating, is sufficient for exposures up to approximately 103 dB(A) for an 8-hour shift on a single earplug without combining with earmuffs. See the NRR Hearing Protection Guide for exposure calculations.

How do I properly insert the Howard Leight X-Treme foam earplugs?

Use the three-step roll-down method: (1) roll the plug between clean, dry fingers until it forms a tight, narrow cylinder; (2) reach over the head with your opposite hand and gently pull the top of your ear up and back to straighten the ear canal; (3) insert the compressed plug deeply and hold it in place for 20–30 seconds while the foam expands to fill the canal. A properly seated plug should sit mostly within the canal with only a small portion visible.

Can the R-01526 earplugs be reused?

These are single-use disposable earplugs. Replace them at the start of each shift or whenever they become soiled, wet, or visibly damaged. Repeated use degrades the foam's expansion characteristics and can compromise attenuation. For multi-shift reusable options, see the Reusable vs. Disposable Earplugs guide.

What is the difference between R-01526 and XTR-1?

Both are Howard Leight X-Treme foam earplugs. The R-01526 is rated NRR 33 and ships in a 200-pair bulk box. The XTR-1, available at WC Safety as the Howard Leight X-Treme XTR-1, is rated NRR 32 and ships in smaller pack sizes. The R-01526 is the preferred SKU for established dispenser programs needing maximum attenuation at bulk economics.

What material is the X-Treme R-01526 made from?

The X-Treme R-01526 uses soft polyurethane foam with a smooth, closed-cell outer skin. The closed-cell surface resists absorbing oils and moisture during insertion compared to open-cell foam, helping the plug maintain a cleaner surface when rolled for insertion.

Do the X-Treme R-01526 earplugs fit small ear canals?

The R-01526 is a standard-size foam plug designed to fit a wide range of adult ear canal geometries through the roll-down self-adjustment mechanism. Workers with notably small canals may find the plug difficult to seat deeply enough for full attenuation. Check the Ear Plugs collection for alternative sizing.

When should I double up earplugs and earmuffs?

OSHA 29 CFR 1910.95 requires dual hearing protection when a single device cannot reduce exposure to at or below 90 dB(A). This typically applies to sustained exposures at or above 100 dB(A). NIOSH recommends dual protection above 105 dB(A). When combining, add 5 dB to the higher of the two NRR values. Full guidance is in the OSHA Hearing Conservation Program Guide.

How long does a 200-pair box last on a job site?

At 1 pair per worker per shift: a 10-person crew burns through a box in 20 shift-days (4 weeks at 5 days/week). A 50-person crew consumes one box every 4 shift-days. Plan your reorder frequency based on crew size and shift count, not box count alone.

What is ANSI S3.19 and why does it matter?

ANSI S3.19-1974 is the American National Standard for measuring real-ear attenuation of hearing protectors using psychoacoustic testing with human subjects. It is the basis for the NRR labeling required by EPA regulations (40 CFR Part 211). All NRR ratings on products in U.S. commerce must be derived from ANSI S3.19 testing, giving you a standardized, comparable basis for evaluating one earplug against another. See the NRR Hearing Protection Guide.

Why does earplug color matter for compliance?

Under OSHA 29 CFR 1910.95(c), employers are required to enforce hearing protection use in posted noise areas. High-visibility orange earplugs like the X-Treme R-01526 allow supervisors to visually confirm plug use from a distance without stopping work. This is a practical compliance advantage over skin-tone or low-contrast earplug colors in active job site environments.

Are R-01526 earplugs compatible with standard wall dispensers?

Yes. The 200-pair bulk box is the standard refill quantity for most industrial wall-mount earplug dispensers. Howard Leight and third-party manufacturers produce dispensers sized for individually-wrapped foam plug pairs. Confirm your dispenser's compatible refill SKU with your safety supply distributor before ordering at scale.

Where can I buy the Howard Leight X-Treme R-01526?

The R-01526 is available at WC Safety and on Amazon. Industrial safety distributors including Grainger, MSC, and Fastenal typically stock it as a standard catalog item.

How does the X-Treme R-01526 compare to Moldex foam earplugs?

Moldex Pura-Fit (6800 series) is the direct NRR 33 competitor. Both use polyurethane foam in a tapered bullet shape and ship in 200-pair boxes. Differences are largely ergonomic — some workers prefer the Moldex surface texture or slightly different taper profile. For a full comparison across Moldex earplug lines, see Best Moldex Earplugs. For environment-specific earplug recommendations, see Best Foam Earplugs for Manufacturing.

Does issuing these earplugs satisfy OSHA's Hearing Conservation Program requirements?

Issuing compliant hearing protection is one element of an OSHA 29 CFR 1910.95 Hearing Conservation Program — but not the only one. A compliant program also requires: noise monitoring, annual audiometric testing, employee training, recordkeeping, and engineering control evaluation. See the full OSHA Hearing Conservation Program Guide for all compliance requirements.

Are these earplugs food-processing safe?

The R-01526 does not carry a metal-detectable or food-safe certification in this SKU. Food processing, pharmaceutical, and clean manufacturing environments that require detectability should specify metal-detectable earplugs (available in the Ear Plugs collection) to meet HACCP and product contamination control requirements.

Are these the best earplugs for industrial workers?

For environments requiring maximum NRR attenuation from a disposable plug at bulk pricing, the R-01526 is among the top options available. Whether it is the best choice for your specific operation depends on canal geometry distribution in your workforce, corded vs. uncorded preference, and whether your exposure levels require NRR 33 specifically. See Best Hearing Protection for Industrial Workers and Best Earplugs for Work for environment-matched comparisons.

Is Howard Leight a reputable hearing protection brand?

Howard Leight is a brand under Honeywell Safety Products (formerly Sperian and Bacou-Dalloz). The brand has been manufacturing hearing protection for industrial markets for decades and is one of the largest-volume earplug suppliers in North America. Howard Leight products are tested under ANSI S3.19 and carry NRR ratings consistent with EPA labeling requirements under 40 CFR Part 211.

About the Reviewer

Steven Eaton — WC Safety Editorial
Steven Eaton manages product selection and safety compliance content at WC Safety. He has sourced and evaluated hearing protection, respiratory PPE, and fall protection equipment for industrial customers for over a decade, with a focus on OSHA compliance applications across manufacturing, construction, and oil & gas sectors.

Reviewed by: WC Safety Editorial Team

Review Methodology

This review is based on: (1) product specifications as listed by the manufacturer under ANSI S3.19 NRR labeling requirements; (2) regulatory text from OSHA 29 CFR 1910.95; (3) ANSI S3.19-1974 standard methodology documentation; and (4) WC Safety's accumulated experience selling hearing protection to industrial buyers. We do not conduct independent laboratory attenuation testing. NRR values cited are the manufacturer-labeled values derived from ANSI S3.19 REAT testing. OSHA derating calculations use the standard (NRR − 7) ÷ 2 formula specified in OSHA guidance documents.