Constructed by solid ABS shell and thickened foam, the ear muffs achieve NRR 28 dB (SNR 34 dB) rating, ANSI S3.19 (US) certified, and effectively reduce the damage of high decibel noise while ensuring comfy wearing Ideal for lawn mowing, shooting, flight, construction, sports events, studying, factory, and woodworking, extremely suitable for operating heavy machinery or landscaping business, and for kids enjoying fireworks, monster jam. Also a good choice for the autism The flexible and ergonomic headband and 360 degree rotatable ear cups can be adjusted by pulling the metal rack to fit most sizes from kids to adults and various occasions. Kindly Note: For more efficient sound isolation, the earmuffs are snug and a little tight before using. If you feel tight, we recommend putting it on a box or other objects for 1-2 days to stretch the headband and get it looser Soft padded headband reduces the pressure on your head for superior comfort. The generous space inside the ear cups ensures breathability and causes no pain in your ears Compact folding design is for easy storage and convenient portability, fits well in most bags or backpacks while takes only a small space, enabling you to bring them to any noisy scenes, Weight: 1.543235834 pounds