Take charge of how you view the underwater world with the U.S. Divers Admiral Mask as this is the perfect choice for those snorkelers with average to larger faces. This is due to the generous sealing surface of the silicone skirt as it offers excellent light penetration into the viewing area of the mask. The twin lenses are made of tempered glass and the shape of each lens offers above average horizontal and vertical fields of vision. The Pro Glide buckle system allows two ways to adjust the silicone strap and it has a lever action to get initial adjustment and a push button to fine tune the strap when it is on the face. The buckles also use a vertical swivel for a better range of personal strap placement. The frame is designed for maximum light penetration without compromise to durability.