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. Unlike The Guardian in Tan, the Grey is made of a heavier weight cotton with a denser weave that allows it to be made of a single ply. 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.