Features: Vented foam design for increased air flow and comfort. Sonically welded band gives the face shield added strength and reliability. Available in both elastic band and adjustable Velcro band. Lightweight and comfortable to wear, quick and easy to don. Excellent protection against potential contamination from blood pathogens, body fluids, or harmful chemical splash. Hypoallergenic foam band can absorb sweat and provide enough room for eye glasses or safety goggles. Specification: Adlut Size: 32 * 22.5 * 4CM Kids Size: 27 * 17.5 * 4CM Material: PET + sponge There is 2-3% difference according to manual measurement. please check the measurement chart carefully before you buy the item. 1 inch = 2.54 cm Please note that slight color difference should be acceptable due to the light and screen.