【Dry Top Anti-Splash Design】Snorkel set adult installs an one-way inhalation valve and has a mobile floating ball on the top of it. Once the tube is underwater, the tube entrance will be closed by the floating ball,Whether you are swimming or diving, you can easily handle it. 【Anti-Fog Lenses Provide Clear Vision】The scuba mask and snorkel mirrors are equipped with anti-fog film to avoid fogging inside the lens when the nose exhales. Now you can enjoy all the underwater scenery clearly. 【Food Grade Material is Safe and Non-Toxic】The diving snorkeling set and its mouthpiece are made of food-grade high-quality silicone, non-toxic and odorless, unisex and safe for children. 【Safety Eye Protection】The mirror surface of the snorkeling mask is made of tempered glass, which is strong and anti-fog and can safely protect your eyes. It is the best choice for swimming. 【Comfortable to Wear and Watertight】The diving mask is designed with soft ribbed silicon face seal mold technology. It fits most people's faces,The adjustable strap allows for a perfect fit to the face when worn. Watertight seal.