The Mares Bungee Strap, Simple yet innovative? 3 sizes fit all ? Ergonomic design ? 100% compatible with the Mares fin line Created as a smart alternative to the steel spring straps- this novel item relegates adjusting a fin strap to the past. Bungees exceed steel springs in all aspects: higher elastic properties- unaffected by sun- salt and chemical agents- lower weight and lower cost- and Mares has 40 years of experience using bungees as a key element in spear guns. With the new Mares bungee strap donning and doffing a fin is a breeze- and the comfort during the dive is guaranteed by the new ergonomic heel cover.