Material: silica gelEasily attach to any regular snorkel/dive mask: The keeper could easily attach to Cressi/Speedo/ US/Phantom and other brands standard dive snorkels/masks/goggles. Quick release adjustable clip easy to clip it on/off a diving mask, allowing movement up and down the snorkel tube, for a comfortable position. Your hair doesn't get tangled as much in this type of attachment between the mask and snorkel.Food-grade liquid silicone mouthpiece: Super soft and safe material for the mouthpiece, very comfortable in your mouth and provides a good seal. form-fitting with angled and corrugated mouthpiece design, allowing for prolonged use. Its a removable and replaceable silicone mouthpiece if necessary.Longer oval upper tube provides more air, and breath effortlessly: A large diameter tube will give you full breaths without making you struggle to catch your breath. The upper tube is curved and comes close to your head, which will prevent drag your mouth. Its a perfect snorkel for snorkeling, skin diving, scuba diving, swimming etc.Easily blow out water through one way purge valve: Sits at the bottom of a bulblike reservoir thats offset from the mouthpiece tube, which made it effortless to clear and bone dry. Water can even be cleared out of the dry snorkel while under water, all you have to do is give it a good blow.