The Seac Fast snorkel features an anti-splash top that effectively blocks water from entering the snorkel. It also includes an innovative purge valve system that sits below the mouthpiece for rapid emptying of water. The Seac Fast's tube is made of durable PVC with bellows in hypoallergenic silicone, and its corrugated flexible hose allows you to manage the angle of the nozzle. It has a silicone mouthpiece that features a comfortable ergonomic fit with plenty of bite for teeth to keep your jaw relaxed.