Donning and doffing a fin is a breeze with these bungee straps—and comfort during the dive is guaranteed thanks to the ergonomic heel cover! One-hundred precent compatible with the Mares fin line, these bungee straps are a smart alternative to the steel spring straps. Bungees offer higher elastic properties than steel. Theyre unaffected by sun, salt and chemical agents, and offer a lower weight and lower cost.