This is the snorkel that allows proper freestyle swimming stroke technique without having to take a breath to the side. Part of regular training programs by collegiate sports teams, this snorkel is equally beneficial for accomplished swimmers looking to improve their stroke efficiency. It attaches to the wearer's forehead with a strap, leaving ample room for swim goggles. Keeping the head aligned with the spine while swimming helps to develop body balance, rotation, and alignment in the water--a solid foundation for learning more advanced skills such as bilateral breathing. The snorkel also improves CO2 tolerance and VO2 max with normal use. Built-in purge valve allows user to expel water. Solid silicone, PVC, and ABS construction. 18 3/4" L x 7" W. (1 lb.)