The sporty U.S. Divers Cozumel Snorkeling Mask has shatter-resistant polycarbonate lenses with a soft TPR face skirt for a comfortable leak-free fit. An anti-fog treatment provides ultra-clear vision. 2-window design delivers top-to-bottom visibility. 3-way-adjustable Pro-Glide buckles provide a secure, adjustable fit. Shatter-resistant PC lens Anti-fog treatment 2-window mask design with top-to-bottom visibility Soft, comfortable face skirt 3-way-adjustable Pro-Glide buckles