The zoggs centre line snorkel enables you to focus on your stroke while swimming without having to turn the head to breath it features a soft medical grade silicone mouthpiece and a one way purge valve that ensure clear and easy breathing the snorkel has a phthalate free tube and a vylux with a hydrodynamic design it is equipped with an adjustable rubber head bracket and a reinforced split yoke strap that provide a perfect fit to your head resulting in a very low water resistance