I need a buoyancy pad when boating. And found the pen useful while snorkeling. For swimming, one of these devices would probably be more than adequate. Floaty Pad Mount: Floaty features a large adhesive pad that allows it to be attached to the back of your GoPro case. Floaty covers almost the entire back of the GoPro body, so aligning it when attached to the back can be a bit tricky. You want the pad to be well centered, but you don't want it getting in the way of the GoPro's latch at the top when it does. What worked for me was placing the floaty pad on the table sticky side up. Then press the included replacement door onto the floaty pad. This allows you to see through the transparent door when you attach it to the pillow. Then remove the original GoPro flip and reinstall the new one. It's a lot easier to control alignment than trying to press the floaty against the whole body of the GoPro.
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