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Open-heel fins have an adjustable strap over the heel making them more comfortable and a better fit to different shape and size feet. Slip your boot in to the foot pocket and the heel strap will hold the fins onto your foot. Either a ratchet rubber strap or a bungee/spring strap will adjust the size of the pocket to keep the fin in position on your foot. Look for blade style, like channel blades, hinged or split fins as they all work in slightly different ways to do the same job but you may have to modify your fin kick.