These masks are made from 220g/m2 microfibre, a nonwoven fabric made of 70% polyester and 30% polyamide. No chemicals or glues were used in the production, so it can be used without worries about allergies. The material has OEKO TEX 100 class 1 certificate. The microfibre is breathable, quick-drying, very absorbent, reusable, does not irritate the skin and is hypoallergenic. Its microfibre material as the touch & feel of a glasses cleaning cloth.