About this item Anti-leak Liquid Silicone Snorkel Mask This snorkeling gear is made of a soft high-grade liquid silicone. Silicon materials are pleasant on the skin and seal around the face and nose comfortably. The flexible mask skirt with double seal provides perfect amount of suction to stay sealed on face even with slightest pressure. You can wear it for much longer without having face mask lines in your face. Easily Adjust to Fit All Face The diving mask has adjustable straps with an anti-slip locking mechanism on both sides. Adjust silicone strap to get a good seal and individual comfort. Easily fit different face or haed shapes well. Both adult and teen are able to use it with a good fit. Quality snorkel gear helps you focus on having fun. Dry Snorkel with One Way Valve Our dry snorkel adopting float valve at the top of breathing tube. the float valve closes to keep water out of the snorkel when you dive and would opens to let you breath easily when above water. One-way purge valve help to clear out water leak into snorkel by quick blow through the mouthpiece. This adult snorkel is a nice touch if you are in rougher water or are constantly diving during snorkeling. Before Use Before ever using your mask, treat the lenses. You only need to focus on the lens surface on the inside of the mask. The outside will never fog when underwater. The most popular method is to use common white toothpaste, dab some on your finger, and rub it on the lens surface. Then, rinse off the remaining toothpaste from the lens. ",