Unlike headphone models, our Hearing Protector is lightweight and comfortable to wear, even with a hat and glasses, and it's laboratory tested for a Noise Reduction Rating (NRR) of 20. Laboratory tested! Won't interfere with wearing hardhat or glasses. Soft foam pods adjust to your ear canals. Flexible chin band holds it comfortably in place. Ideal for jobs with frequent interruptions. One size fits all 5" W x 5-1/2" H Weighs 8 grams Made of plastic with Caboflex?????? ear pods