The Supra mask is perhaps our most comfortable and innovative mask yet. The nose bridge web flips up to create a seal for protection as well as acting as a wireless support system that stays-put on your nose without applying pressure. The Supra mask is stocked with our removable copper wire, for people who wish to have the added option of a more customizable fit. It is by far the go-to option for long periods of comfortable protected wear. Designed to be worn as-is or over another mask, the Supra has plenty of coverage and tons of comfort. . The body of the mask is constructed of 100% cotton military-grade ripstop material. The inside layer is fused with 100% Poly Interlining acting as a second layer of filtration. One more feature is our Folded Loop label which serves two functions, first it wicks and retains skin oils away from the body fabric and it also has a place to personalize it to avoid possible mixing or loss. Adjustable straps help insure a secure and snug fit.