Kraken Aquatics Swimmer's Snorkel with Comfortable Silicone Mouthpiece and One-Way Purge Valve for Swimming Gear, Training and Therapy | Blue Center mount snorkel design: Allows swimmer to keep head stationary and focus on swim technique, body position and efficiency which makes it the perfect addition to your swimming gear. Comfortable silicone mouthpiece: The soft, flexible, premium quality silicone mouthpiece feels so comfortable that you'll forget it's even there. One-way purge valve: Easily clear any water out for clear and easy breathing while lap swimming. Adjustable padded head bracket: Simply pull the straps to desired fit and the buckle will hold the straps securely in place. Special tube design: Low profile snorkel tube shape helps to reduce water resistance while swimming.