The snorkel feels the material well and is odorless and tasteless. He is very good in the mouth and can be easily fixed with the practical clip on the goggles. During normal snorkel gear there are no complaints. Solely if you breathe a little faster at an underwater chase, the valve closes immediately and you can not breathe. Dives I have not done, so I can not say anything about the underwater behavior. Recreational snorkelling but a top unit!