This is the XS Scuba FLO Open Top Spearfishing Freediving Snorkel Features: Contoured shape minimizes drag Open top design maximizes gas exchange Non-purge mouthpiece allows for the displacement clearing method The internal bore is smooth to prevent residual water Easy-to-use adjustable snorkel keeper Uses a silicone mouthpiece The FLO snorkel a quality, contoured, open top snorkel. Since the lower end is a traditional, non-purge type, it allows for the displacement clearing technique. This makes the FLO a favorite among freedivers, spearos and veteran scuba divers. Go with the tried and true. Go FLO!"