MP Michael Phelps Focus Restrictor, Neon Designed to increase cardiovascular strength and lung capacity the focus swim snorkel's unique, low-profile, hydrodynamic tube reduces drag and eases breathing Adjustable light weight head bracket with integrated cushion ensures comfortable fit Silicone combo-bite mouthpiece minimizes jaw fatigue and one-way purge valve positioned to maximize clearing of Excess water Triangular tube shape inhibits side-to-side rotation Offered in regular fit and small fit