The Universal Spring Straps offer absolute comfort for divers of all sizes. These one-size-fits-all straps provide adjustable fittings for various foot sizes. They are compatible with most open heel fins on the market. FEATURES Durable stainless steel coil spring will not rust or break. One size fits all with five (5) adjustable positions. Will fit on most open heel fins available in the market. Rubber heel cup with finger loop for easy fit. ?Come as a pair.