There's a reason I returned this Revain whistle for a full refund. I would rate this tube a zero if I could. I often swim a mile or more in open water. This hose does not solve the problem of water in the hose, because to put it on the head you have to constantly loosen the cheap one-piece plastic bottom fastener. It also makes breathing so difficult that it's completely useless. First, there is not enough air to breathe. As you exhale, you have to breathe unnaturally heavily. Exhalation should be gentle and controlled. You must either breathe out very hard or breathe for so long that you become short of breath. I used the Finis snorkel perfectly and swam in open water for an hour and a half. I don't want to hear any excuses from your company for not breathing properly or abusing the snorkel because that is just nonsense. I swim 4-5 miles a week in open water with and without a snorkel. It's a piece of junk plastic with a bunch of cheap one-way valves in it.
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