CRESSI ALPHA ULTRA DRY SNORKEL BLACK/BLUEFeatures a float mechanism which closes instantly to prevent water from entering the snorkel whether accidentally or purposely submerged Flexible lower bore reduces jaw fatigue Mouthpiece drops away when not in use great for scuba divers High quality silicone mouthpiece is comfortable and durable Angled mouthpiece reduces jaw fatigue Lower purge valve allows water to be quickly expelled Streamlined design reduces drag while swimming Adjustable clip