As others mentioned this quickly fills with water. The mouthpiece doesn’t seal to the tube resulting in leaks within one length. Head strap won’t stay tight either. Disappointed with this useless product. 

Use tio focus on improving stroke technique

Very disappointed, wasted money. I needed a replacement snorkel for my kick sets. Purchase this unit and found that the snorkel tube cross-sectional area is 50% of the Finis unit, restricting airflow. There is no drain valve to purge. The mouthpiece seal is poor, water leaks into snorkel with less than 25 yards traveled. This makes the Speedo snorkel unuseable and thanks to Dick's sporting goods unreturnable. Dick's would not accept a return or offer a replacement. The Finis Snorkel is a much better unit all around, save your money.

For some reason, no matter what I do, this snorkel leaks. I have a Finis which I hope I would replace this with but I won't, Finis is better. Also the strap that fits around the head it slips as you swim which means you have to stop to adjust it too often.

I am not happy with it, for some reason, no matter what I do, it leaks. Also the strap slips all the time which makes the snorkel section loose, not very well designed.