UM-33 Mask: 3-window design with an enhanced panoramic view and peripheral vision; Pure Silicone Skirt and Strap; EZ adjust buckle technology; Hyperdry Purge Technology for ease of mask clearing; High-quality polycarbonate frame; ClearVu tempered glass lens; Fits Adult Medium to Large faces; USP-250 Snorkel: Pure Silicone Flex-Neck and Mouthpiece; Patented Hyperdry Elite Dry Top Technology; Large capacity drain chamber and purge valve for easy clearing; Ortho-consciously designed mouthpiece for ultimate comfort