Bull's Eye hearing protector provides excellent noise reduction, yet features a low-profile. Easily adjustable for a comfortable fit. Adjustable, vented headband design reduces heat build and improves comfort when worn with hats. NRR 27 dB. Peltor Sport Bull's Eye hearing protector has a noise reduction rating (NRR) of 27 dB. It features a low-profile ideal for shooting and hunting. Lightweight design for comfort and extended wear. Adjustable, vented headband design reduces heat build and improvES Comfort when worn with caps and hats.