The handmade, triple layered Osmosis Face Cover features a soft, breathable cotton inner layer and an outer layer of Ice Silk, better known as rayon or polyviscose fiber. Ice Silk is an antistatic man-made material that is smooth and cool. It has better gas permeability and shape retention than cotton, making it more comfortable to breathe through and wear for extended periods of time. Our Face Cover also features a concealed metal nose clamp for custom fit and comfort, adjustable elastic ear bands, and a filler layer between the outer and inner layers. One size fits most. Not for medical use.