MSViper Surfing fins feature: Beveled sidewalls improve control Delta tail design; which I have found to enhance control and minimize drag. Maximum foot pocket drainage eliminates any sand or pebbles in your kick. Rivet grip tred enhances footing on slippery rocks yet won't snag on coral or sharp objects All VIPER surfing fins float high and are visible in the roughest surf conditions. All VIPER surfing fins are made of superior 100% natural rubber compounds. Boxed in a sturdy recycled cardboard box and printed with soy based ink.