The Zoggs Center Line Snorkel is a handy swim training aid that allows you to focus on perfecting your stroke without having to turn your head to breathe. Using a swimming snorkel allows you to concentrate on your body position in the water because you don't have to turn your head to breathe. You will be able to align your head and spine and keep your lower body higher in the water. By not having to look away to breathe, you can see your hand position as it comes down into the water and correct if necessary. The adjustable head attachment is designed not to interfere with your glasses, providing a secure fit and reinforced split yoke strap for comfort. The snorkel comes with a nose clip and an angled Vylux mouthpiece for superb comfort and encourages focus on the stroke rather than turning for the next breath.