This is a mask and gaiter in one! Each washable gaiter is made of a double layer of stretchy knit fabric. Easy and comfortable to wear, perfect for those days when you are going in and out of your home. S/M Size: 18" circumference, 15" max width. Fits most ages 10+ L/XL Size: 20" circumference, 15" max width. Model images show fit only. Care Directions: Wash before first use! Wash with warm water with detergent. Line dry or tumble dry low. Wash in between every use.