Great product to help prefect body roll.  Should be used during training and not racing.

I like it and am glad I have it, and it does exactly what it claims. Bear in mind that it will create extra drag, so don't expect to keep up with fast swimmers while using it.

Bear in mind that while you'll get an audible "click" when you roll, you'll still need close supervision by your coach to know if when you're rolling correctly, so this tool needs to be used in conjunction with someone watching you, at least initially.

This is a great product! Gives instant feedback to the swimmer. We used this at practice with instant results. Only drawback is the belt is large and not very adjustable for junior swimmers.