This is the Mares Bungee Replacement Fin Strap Pair For Open Footed Fins Features: 3 sizes: xs/s - r - xl 5 colour variants: bk-wh-bl-yl-lm 2 extensions for better adaptability Ergonomic heel cover Wide eyelet for use with thick gloves. Replacement straps for open footed fins. Ergonomic and easy to adjust, the new Bungee Straps are a smart alternative to steel spring straps. Available in three sizes and five colours to give your dive a distinctive style."