I was mistakenly sent one of these by a company (which shall remain nameless) and I tried it and LOVED it so much I bought this one for me and gave that bigger one to my husband. We now use it annually on Caribbean cruises and it works beautifully. I hate the ones where you have to suck air through the tube. This one allows you to breathe normally AND see unhindered. The only caveat that we've learned while using it is if you have facial hair, it'll cause water leaking into the mask so you may want to shave it down almost to the skin before snorkeling. I wish I can give this 10 stars! One of the best inventions ever.