This is a 3M/Peltor Earmuff known as the ShotGunner, model 97040-PEL-6C.
Featuring low-profile cups with cut-outs" the Shotgunner earmuffs are ideal for use with rifles and shotguns. The fully adjustable headband is ergonomically engineered to reduce pressure points.
Features:
Noise Reduction Rating 24 dB
Lightweight and Comfortable
Foldable for Storage
Low-Profile Cups with Cut-Outs