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Same Great Protection. Slimmer Fit.

ISOtunes Sport DEFY Slim is an ultra-comfortable electronic earmuff, featuring superior protection and environmental awareness. With active gunshot noise suppression, Bluetooth compatibility, and a background noise-dampening microphone, DEFY Slim allows you to align your sights with ease without sacrificing your safety.


Backed by:

  • One Year Warranty (if it's our fault we fix it, no questions asked)
    • 30-day Money Back (you won't need this, but just in case)
    • Friendly, US based customer service team


Tactical Sound Control™

Proprietary technology that amplifies sounds you want to hear up to 8x their natural volume, while still protecting you from harmful gunshot noises in under 2 milliseconds.

21 dB of Noise Reduction

Most gunshots register between 150 - 170 decibels, which can quickly damage your hearing. Combat those dangerous noise levels and shoot safely all day long.

Ultra-Slim Design

At just 310 g, this ultra-slim muff weighs 100g less than other leading earmuffs. Enjoy all day performance and comfort, while aligning your sights with ease.

Full Product Details

Tactical Sound Control™ Technology enhances your hearing by 8x while protecting you from high-impact noises in under 2 milliseconds.

Ultra-Slim Profile

21 NRR tested and approved to ANSI s3. 19-1974 | CSA Class B

Bluetooth 5.0 connects, and dual-connects, devices 30+ feet.

Lightweight Design at just 310 grams.

Up to 25 Hr Battery Life with 2 AAA batteries.

SafeMax™ Technology limits volume output to 85dB for all-day, damage-free listening.

IPX4 Durability for sweat, water, and dust resistant protection.

Noise-Isolating Microphone for clear communication in loud environments.


ISOtunes Sport DEFY Slim comes with 2 AAA batteries and an auxiliary cable.


Warranty & Guarantee

Warranty: All ISOtunes® Sport products come with a 1-year warranty against defects in material and workmanship. The warranty does not cover damage by misuse, abuse or unauthorized modifications. We will provide a free exchange for customers who experience defective products within 12 months of purchase.*

Guarantee: Your satisfaction is guaranteed with a 30-day money back promise. If you are not completely satisfied with your product, please contact us within 30 days of purchase and we will prove a full refund*.

*Apparel & Merchandise items are excluded from warranty & money back guarantee. Only items that have been purchased directly from can be returned. ISOtunes Sport products purchased through other retailers must be returned in accordance with their