Reusable, personal-use, non-medical grade. This product is not a medical device. It is not intended to be personal protective equipment and should not be used by healthcare professionals or used in a healthcare/clinical environment or setting. The product is not intended to prevent or protect from any form of illness or disease (or otherwise). Overview inner side: 220g bamboo fiber cotton (antibacterial) outer side: 100% polyester Sizing & Fit One size fits most adults.