This is a neoprene sleeve that fits over the strap to keep the strap in place. And he's okay with that. However, it is extremely thin and inexpensive. He will most likely have trouble swimming, but he has no chance of keeping the mask afloat. Zero. It does not replace cheap rubber bands that often wear out. If this is the case, you will most likely lose this part when dealing with a broken band underwater. Replacing the Marsoops bracelet is a much better choice. It's cheap junk in comparison. Do not buy.
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