The O'Hunter Phantom Snorkel is made with 100% silicone and is a J valve style. Perfect for spearfishing or freediving as it is very streamline however it can also be used for snorkeling. The semi flex barrel allows it to give the most comfort and flexibility yet be sturdy enough. It comes with a sliding snorkel keeper that you use to connect it to your mask of choice. When spearfishing, it is preferred to not have a purge valve on the snorkel to prevent drag, this is why the OceanHunter Phantom snorkel is perfect for spearfishing and freediving.