One size fits most adults Internal pocket for replaceable filters Adjustable built-in aluminum nose bridge for secure fit, tighter seal, and reduces fogging when worn with eyewear The?ZANheadgear?Adjustable Face Mask features 2-layers of protection with an interior pocket for a PM 2.5 filter (1 x included). The built-in aluminum nose bridge provides a secure fit, creating a tighter seal & reduced fogging when worn with eyewear. They are soft and breathable, and the metal nose strip keeps the mask in place even after hours of wear. The adjustable face mask provides coverage of the nose, mouth, and chin with adjustable elastic ear loops. Material: 100% Cotton