Title: ok, but there a risk of them to fall of your foot if not very tight
Product review: Fins are ok, but the buckle which holds them on your foot is of a rotating "hook" design, which means that if for some reason the tension is not too high, the hook may turn and coupling rod will escape through the hook opening thereby unlatching the buckle and the fin may slip off your foot if you don't catch it with your hand in time. The fin should work in theory if tension is high enough and the buckle feels tight and snag on your foot. I had to catch one fin once when I was swimming with them for the first time. I see it as a design flaw. The fin should never be able to slip off the foot, even if the strap becomes loose. It would be devastating if it happens in the open sea, and slightly embarrassing in the swimming pool.
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