The Guardian mask incorporates features from what is perhaps our most comfortable and innovative mask, The Supra. The nose bridge web flips up to create a protective seal and acts as a wireless support system that stays-put on your nose without applying pressure. Like the Supra, The Guardian 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 Guardian has plenty of coverage and tons of comfort. The body of the mask is constructed of 100% cotton fabric, while the inside layer is fused with 100% Poly Interlining that acts 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.