Radians Def-Guard 23 Review: NRR 23 at the Bottom of the Range

Radians Def-Guard 23 Review: NRR 23 at the Bottom of the Range — the short answer

Short answer: this radians def-guard 23 review covers a passive over-the-head muff at NRR 23 - the cheapest protector Radians makes, and it publishes its rating, which is more than one of its stablemates manages. The reviewed listing is live here; plan the exposure on the derated figure, not on NRR 23. 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.

Entry-Level Earmuff Built for OSHA Action-Level Sites

Published June 19, 2026 · Last updated July 27, 2026

Radians Def-Guard 23 Earmuff NRR 23 Review (2026)

If your job puts you in environments that hover around the 85 dB OSHA Action Level threshold, you do not need a high-NRR tactical muff. You need something affordable, comfortable enough to wear all shift, and compliant with ANSI S3.19 so your safety program holds up to an OSHA inspection. The Radians Def-Guard 23 targets exactly that use case. At roughly eight dollars on Amazon, it is the kind of earmuff that gets stocked in bulk, handed out at the site gate, and replaced when it wears out rather than repaired.

This review is based entirely on verified product specifications, ANSI S3.19 test data, and OSHA 29 CFR 1910.95 requirements. No claims about durability, comfort, or real-world attenuation have been fabricated or extrapolated beyond what the standard permits. If you are evaluating the Def-Guard 23 for your hearing conservation program or your own daily use, the breakdown below will tell you exactly what you are buying.

The Def-Guard 23 carries an NRR of 23 dB, placing it in the mid-range of passive overhead earmuffs. OSHA requires a 50 percent derating of labeled NRR when estimating real-world protection for compliance planning. That means the effective attenuation for administrative purposes is approximately (23 − 7) ÷ 2 = 8 dB of noise reduction in the field. For environments running at or near 85 dB, that margin is adequate. For sustained exposures above 95 dB, you should look at higher-NRR options or dual protection.

Who the Radians Def-Guard 23 Is For

The Def-Guard 23 is positioned squarely at general-industry buyers who need a compliant, cost-effective passive earmuff for hearing protection programs operating in moderate-noise environments. Ideal end users include:

• Manufacturing and light assembly workers in facilities where ambient noise sits between 85 and 95 dB.
• Landscaping and groundskeeping crews operating gas-powered equipment in intermittent noise exposure.
• Facility maintenance technicians who enter mechanical rooms or compressor areas on a periodic basis.
• Safety managers building a loaner-earmuff pool or stocking high-turnover PPE inventories.
• Warehouse and logistics staff near loading docks with fork truck traffic.

The Def-Guard 23 is not the right choice for chainsaw operators, demolition crews, airport ground staff, or any application with sustained TWA (Time-Weighted Average) exposure significantly above 95 dB. Those applications call for earmuffs with NRR 28–33 or a dual-protection combination of earplugs plus earmuffs. See our best hearing protection guide for a full noise-level decision matrix.

Strengths of the Def-Guard 23

ANSI S3.19 Certification and NRR Labeling

Every passive earmuff sold in the United States that makes an NRR claim must be tested under ANSI S3.19. That standard defines the lab protocol: subjects with individually fit protectors, octave-band real-ear attenuation at threshold measurements, and a specific formula for deriving the single-number NRR. The Def-Guard 23 passed that protocol at NRR 23, which means the label is not a marketing estimate — it is a certified, reproducible measurement. For safety managers who need documented compliance for OSHA 29 CFR 1910.95 hearing conservation programs, certification is non-negotiable. This product clears that bar.

No-Battery Passive Design

Electronic earmuffs introduce battery management into the PPE workflow. Workers forget to replace batteries, batteries drain mid-shift, and electronic units require firmware or hardware servicing. The Def-Guard 23 eliminates all of that. There are no power switches, no battery compartments, no connectivity settings. You put it on and it attenuates. For bulk deployments — particularly in environments with high PPE turnover or where workers may not have a consistent personal device — passive simplicity is a genuine operational advantage. Compare this approach against electronic ear muffs if situational awareness or radio communication is a requirement for your application.

Adjustable Headband for Multi-User Fit

The Def-Guard 23 features an adjustable headband. In a loaner-pool or shared-equipment scenario, this matters: a fixed-size earmuff will not achieve adequate acoustic seal on workers at the extremes of head circumference. An adjustable band allows the cups to be positioned so the cushions compress consistently against the jaw and temporal area. Proper cup seal is what translates laboratory NRR into real-world attenuation — a muff that does not seat correctly on a given head shape provides substantially less protection than labeled, regardless of the NRR number. For more on how fit affects protection levels, see our NRR hearing protection guide.

Lightweight Build for Extended Wear

Radians describes the Def-Guard 23 as a lightweight design intended for extended-shift wear. Exact weight in grams is not published in the specification sheet, but the entry-level price point and passive construction are consistent with the lightweight end of this product category. Heavier earmuffs increase neck fatigue, create pressure hotspots on the temporal bones, and reduce compliance rates. Workers who find hearing protection uncomfortable remove it. An earmuff that stays on the head provides measurably more protection than one hung around the neck because it is uncomfortable. Lightweight design is therefore a real safety benefit, not just a comfort feature.

Red Shell for PPE Color-Code Compliance

Many industrial facilities use color-coded PPE to enforce compliance by zone: red hearing protection for high-noise areas, yellow for caution zones, and so on. The Def-Guard 23 ships in red only, making it a natural fit for facilities that already use red as their hearing-protection color identifier. Supervisors and safety observers can confirm from a distance that the correct PPE is being worn. This is a minor but operationally meaningful feature in facilities where PPE auditing is conducted on the floor. See our full ear muffs collection for additional color and style options.

Limitations to Understand Before You Buy

OSHA-Derated Effective Attenuation Is Modest

OSHA 29 CFR 1910.95 Appendix B requires that employers applying the labeled NRR to estimate the adequacy of hearing protection derate the NRR by 50 percent for earmuffs when using Method B. The calculation: (NRR − 7) ÷ 2 = (23 − 7) ÷ 2 = 8 dB. That means the Def-Guard 23 provides approximately 8 dB of effective attenuation for OSHA compliance planning purposes. In an 88 dB ambient environment, effective TWA exposure drops to 80 dB — below the 85 dB Action Level. In a 100 dB environment, effective exposure drops to 92 dB — still above the 90 dB PEL. For sustained high-noise exposure, this earmuff alone is insufficient and must be supplemented with earplugs worn simultaneously, or replaced with a higher-NRR device. Consult our hearing conservation program guide for a full TWA calculation walkthrough.

Single Color Option Limits Flexibility

The Def-Guard 23 is available in red only. Facilities that use blue, green, or yellow as their hearing-protection color-code identifier cannot use this model for zone-coded compliance without creating a color conflict. Safety managers building a multi-zone PPE inventory may need to source supplemental options from the broader hearing protection collection to cover their full color-code matrix.

No Published Weight or Cup Geometry Data

Radians does not publish weight, cup depth, or cushion material specification for the Def-Guard 23. This limits the ability to pre-qualify the muff for workers with prescription safety glasses, facial hair, or anatomical considerations that affect cup seal. Buyers who need to qualify a hearing protector for a specific population before bulk purchase will need to order samples and conduct their own fit assessment. Our best earplugs for work guide covers the broader range of protection options including alternatives for workers who cannot achieve adequate earmuff seal.

Not Designed for Communication or Situational Awareness

The Def-Guard 23 is a passive noise-blocking earmuff. It does not pass ambient sound at safe levels, does not integrate with two-way radio systems, and provides no electronic compression for impulse noise. For workers who need to hear verbal commands, audible equipment alarms, or vehicle approach warning, a passive earmuff at NRR 23 worn all shift is an overblocking risk as much as an underblocking risk. Electronic ear muffs with ambient sound amplification and a noise gate are the appropriate solution for those applications.

How the Def-Guard 23 Compares

The table below compares the Radians Def-Guard 23 against common passive earmuffs at similar or adjacent price points. All NRR values are ANSI S3.19 labeled ratings. Effective field attenuation (OSHA Method B) = (NRR − 7) ÷ 2.

The Def-Guard 23 is competitive with the 3M Peltor X2A on raw NRR and often undercuts it on price. For environments exceeding 95 dB TWA, the step up to a 30–31 NRR model provides a meaningful compliance margin.

Compatible Accessories

As a passive overhead earmuff, the Def-Guard 23 requires no proprietary accessories to function. It is worn alone or in combination with earplugs for dual protection in high-noise environments. Consider pairing with:

• Foam or flanged earplugs when ambient noise exceeds 95 dB TWA, for dual-protection compliance.
• A hard-hat compatible earmuff variant if your site requires hard hats with attached hearing protection — note the Def-Guard 23 is an overhead band model and is not listed as hard-hat clip-on compatible.
• PPE storage bags or hooks at workstations for sanitation between users in shared-equipment environments.

Browse the full PPE collection for complementary safety equipment.

OSHA 29 CFR 1910.95 and ANSI S3.19: What You Need to Know

Understanding the regulatory and testing framework behind the Def-Guard 23 is essential for accurate program compliance planning.

OSHA 29 CFR 1910.95 — Occupational Noise Exposure

OSHA's occupational noise standard establishes two key thresholds. The Action Level (AL) is 85 dB TWA over an 8-hour shift. At or above the AL, employers must implement a written hearing conservation program including noise monitoring, audiometric testing, hearing protector provision, and employee training. The Permissible Exposure Limit (PEL) is 90 dB TWA. Hearing protection must reduce worker exposure to at or below the PEL. For the Def-Guard 23, OSHA's 50 percent derating of the labeled NRR yields effective field attenuation of approximately 8 dB. This is adequate for environments up to approximately 98 dB TWA to meet the PEL. For Action Level compliance planning, the math supports use at environments up to approximately 93 dB TWA. See our complete hearing conservation program guide for the full regulatory workflow.

ANSI S3.19 — How NRR Is Measured

ANSI S3.19 defines the laboratory protocol for NRR testing. Trained subjects wearing individually fitted hearing protectors undergo octave-band real-ear attenuation at threshold measurements in a controlled acoustic environment. The single-number NRR is derived from the attenuation data with a statistical safety factor built in. The resulting number represents the amount of noise reduction achieved under ideal fit conditions at the ear. Because real-world fit is never as precise as laboratory fit, OSHA introduced the 50 percent derating to account for fit variability in the field. NIOSH recommends a more aggressive 75 percent derating for earmuffs (yielding approximately (23 − 7) × 0.25 = 4 dB effective). Safety managers applying NIOSH methodology should factor in this more conservative estimate. For a full walkthrough, see our NRR hearing protection guide.

Dual Protection

When earplugs and earmuffs are worn simultaneously, OSHA guidance calls for adding 5 dB to the higher single-device NRR, not adding both NRR values. For the Def-Guard 23 worn with an NRR 33 earplug, the combined label NRR for calculation purposes would be approximately 38 dB, derated to roughly (38 − 7) ÷ 2 = 15.5 dB effective. Dual protection is the OSHA-recommended approach for impulsive noise environments and sustained exposures above 100 dB. Learn more about high-noise hearing protection strategies for shooting and similar high-impulse applications.

Frequently Asked Questions

What is the NRR of the Radians Def-Guard 23?

The Radians Def-Guard 23 has a labeled Noise Reduction Rating (NRR) of 23 dB, as measured and certified under ANSI S3.19.

What is the real-world effective attenuation after OSHA derating?

Applying OSHA's Method B 50 percent derating formula: (23 − 7) ÷ 2 = 8 dB. For NIOSH's more conservative 75 percent derating: (23 − 7) × 0.25 = 4 dB. Use these figures, not the labeled NRR, for compliance planning.

Is the Def-Guard 23 OSHA compliant?

Yes, provided the noise exposure it is protecting against falls within its effective attenuation range. OSHA 29 CFR 1910.95 requires that hearing protection reduce employee TWA exposure to at or below 90 dB (PEL) or below 85 dB (Action Level) for workers who have experienced a Standard Threshold Shift. Confirm your measured TWA against the derated NRR before deploying.

Does the Def-Guard 23 require batteries?

No. It is a fully passive earmuff. No batteries, power switch, or electronics are involved.

Can I wear the Def-Guard 23 with earplugs for dual protection?

Yes. Wearing earmuffs and earplugs simultaneously (dual protection) is appropriate for environments with sustained TWA exposures above approximately 100 dB. OSHA guidance for dual protection adds 5 dB to the higher single-device NRR for calculation purposes. See our NRR guide for the calculation.

Will the Def-Guard 23 fit over glasses or safety eyewear?

Earmuff cup seal can be broken by the temples of safety glasses or prescription eyewear. Radians does not publish specific compatibility data for the Def-Guard 23 with eyewear. If your workforce wears safety glasses, order samples and conduct a fit assessment before bulk deployment.

What environments is the Def-Guard 23 best suited for?

General manufacturing, light assembly, warehousing, landscaping, and facility maintenance in environments where ambient TWA noise runs between 85 and 95 dB. For higher-noise environments, evaluate higher-NRR options from our ear muffs collection.

Is the Def-Guard 23 available in colors other than red?

Based on available product information, the Def-Guard 23 is offered in red only. Check the ear muffs collection for additional color options across other brands and models.

How does the Def-Guard 23 compare to 3M Peltor X2A?

Both carry similar NRR values (Def-Guard 23 = NRR 23; 3M Peltor X2A = NRR 24). Effective OSHA-derated attenuation is nearly identical. The primary differentiators are brand ecosystem, cushion materials, and price. The Def-Guard 23 typically prices lower, making it attractive for bulk programs where per-unit cost is the primary driver.

What does ANSI S3.19 certification mean for the Def-Guard 23?

It means the NRR 23 label is based on a standardized laboratory test protocol, not a manufacturer estimate. The certification confirms the product was tested under the prescribed acoustic conditions and the resulting attenuation data supports the published NRR value.

Can the Def-Guard 23 be used for shooting?

Passive earmuffs with NRR 23 are commonly used at indoor and outdoor shooting ranges. However, for high-volume shooting or indoor ranges with sustained impulse noise above 140 dB peak SPL, dual protection (earmuffs plus earplugs) or electronic earmuffs with impulse compression are preferred. See our best hearing protection for shooting guide for a full category breakdown.

How should the Def-Guard 23 headband be adjusted for best seal?

Position the cups so the cushions make full contact with the skin around the ear, without being pressed against the ear canal or leaving visible gaps at any point around the perimeter. The headband should rest centered on the crown of the head. Re-check the seal after adjustment to confirm no gaps along the cushion perimeter.

Why Trust This Review

WC Safety specializes in occupational PPE with a focus on hearing conservation and respiratory protection. Every product review on this site is written against verified manufacturer specifications and applicable regulatory standards. We do not fabricate performance claims, inflate ratings, or speculate on attributes not confirmed by the manufacturer or the relevant ANSI test standard. NRR values cited here are labeled values from ANSI S3.19 testing. OSHA calculations use the published Method B formula from 29 CFR 1910.95 Appendix B. No Amazon review data or unverified field reports have been incorporated into this review.

Reviewed by Steven Eaton — PPE specialist and editor at WC Safety. Steven has reviewed hundreds of occupational hearing protection devices against OSHA 29 CFR 1910.95 and ANSI S3.19 requirements.
Reviewed by WC Safety Editorial — verified against manufacturer specification sheet and applicable federal standards.
Published: June 2026 | WC Safety, wcsafety.com

What NRR 23 means for the Def-Guard 23 once it is derated

The rating on the box is a laboratory figure, measured on trained subjects with the muff seated perfectly. Two standard corrections bring it back to earth, and they do not agree with each other.

Both sit well under 23, and the OSHA figure is the one an inspector will use. A muff badged 23 is not a muff that removes 23 dB from your shift.

• NIOSH is gentler on muffs than on plugs — 25% against 50% for formable foam and 70% for other plug types — because a muff that is not sealed is usually obvious to the wearer within a minute, while a half-inserted plug looks inserted.
• The cushion is the consumable, not the cup. Foam hardens and cracks with sweat, sunlight and time. Replacing cushions restores more attenuation than moving up a model with a tired seal.
• Anything under the cushion is a leak. Glasses temples, a beanie, a hood or long hair all break the seal, and none of it is in the lab number.

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.