【Type】100% Polyester/ 100% Cotton inner, soft and breathable.【Product description】6.00 Oz. 100% Soft polyester surface and cotton inner, fashionable and breathable to wear. Elastic earloop. Covers your face from nose to chin. Provides a secure and comfortable fit for most persons. These dust covers are not medical grade masks.【Applicable situation】Ideal for biking, camping, running, traveling, climbing and daily use. Protect you from dust, pollen, cold, smog, vehicle exhaust and sandy air.【Applicable population】Both for adults and kids.【Sizes】S, M, L, One Size. There are four sizes in total, and L is the same as One Size.【Parts structure】1 dust cover. The mask filters are not included.【Washing notice】Hand wash preferred, machine wash is not recommended. Please wash before using the mask first time and after every use.【Note】You can insert the mask filter along the opening in the mask and then use it.