The Oceanic Ultra SD Snorkel delivers comfort, durability and smooth breathing in a sporty design. Ultra SD (semi-dry) technology uses a patent-pending deflector to keep water out in wind, waves and rough conditions. Features include a drop-away flex mouthpiece, an oversized purge valve, and a replaceable silicone mouthpiece. The corrugated flex tube holds its shape while bent without collapsing. With its large diamond shape, the main tube can deliver more air and reduce movement of the snorkel in the water. 100% liquid silicone mouthpiece for comfort Semi Dry top for airflow and splash protection Balanced lower purge valve for easy draining Quick detachment from the mask for storage