Adjustable and Non-Slip Design: The position and length of the head strap can easily be adjusted, you just need to press the buckle and pull the soft silicone straps, fits for most people Tapered Front Central Design: The training snorkel tube with tapered designs can reduce the water resistance, attribute to better performance. Moreover, due to the front center-mount designs, swimmers can maintain proper body alignment Durable Construction: The upgraded snorkel tube is made of quality material, which is light, firm, and has strong compression resistance, not easy to deform after bending, providing longer service life Soft and Ergonomic Silicone Mouthpiece: The mouthpiece of this swim snorkel has adopted silicone, which is of no peculiar smell, ergonomic, comfortable, safe, and non-irritating Easy Breath with Purge Valves: This swimming snorkeling gear has one-way purge valves. You could exhale to drain water from the valves, if the water enters the snorkel tube, protecting you from choking water Versatile Training Equipment: Suitable for both adults and kids, this snorkel can be used for lap swimming training in pools and open water environments to improve swimming technique and endurance