Duke mask: 30% larger viewing area to see all the underwater world has to offer without feeling claustrophobic, Dry snorkel keeps water out. Specialized Deflector maximizes air circulation and eliminates fogging, effortless and natural breathing, with a wide breathing area around the nose and mouth. Water draining valves remove any water that may enter the mask, face skirt Is made of soft hypoallergenic. Frame and lens are made of polycarbonate material. Palau fin: full-length side rails help the fin track naturally in the water using a standard scissor kick and direct water flow, blade extends from top of foot pocket for maximum surface area Soft elastic heel straps attach using the quick-release buckle system, long, lightweight and responsive blade, promotes fluid and effortless kick, designed with maximum surface area