The reusable mask is made with a single layer of a stretchable polyester and spandex. Features cool feeling and breathability. Round ear opening fits comfortable and no skin irritation. Effectively isolate dust and viruses in the air, keep warm and can be washed repeatedly. Perfect for short trips, cycling, camping, running, traveling, climbing and everyday use. Size fits most adults. Complies with Prop 65. 13 3/4"L x 5 1/8"W