Constructed out of Neoprene, an abrasion-resistant fabric with high durability. Closed Cell waterproofing blocks moisture and retains optimum body temp. Metal nose bridge can be shaped to conform to your nose. Replaceable active carbon filter removes 99.9% of dust and particulates from the air. Protects against cold weather without building up condensation inside. Dual exhaust ports allow for efficient flow of inhaling and exhaling. Regular Size fits most. Extra Large fits large frames (245lbs +).