Jackson Safety 22613 Smith & Wesson Headband Recoil Earmuff for Extremely Noisy Environment, NRR 29 Ideal for shooting sports, race tracks and use with heavy equipment Adjustable, soft padded headband which adjusts to fit most head shapes and sizes Provides uniform headband pressure for a comfortable and secure fit Durable thermoplastic material retains its shape and pressure for consistent noise reduction Earmuff is dielectric with no exposed metal parts