The Freestyle Snorkel from Finis is a great swim training tool that is great for improving your freestyle swim stroke technique and enables you to focus on your stroke without the need to turn your head out of the water to breathe. The Freestyle Snorkel is more streamlined than traditional swim snorkels and will wrap closely over your head. It will not fill with water as your head should stay still as you swim. Its hydrodynamic design will reduce water turbulence and enable you to swim faster and turn more effectively. There is no purge valve on the freestyle snorkel.