Features: Colour Way: Black Winner of the Australian Design Award Designed to prevent the fin catching when riding in the drop knee position. 3 drain holes ensure water and sand are quickly flushed. Contour Ankle strap designed to ensure maximum comfort. Asymmetrical design based on the body’s natural movement, designed to equally distribute forces around the foot Material: T-FORM Silicon Based CompoundSuper soft silicone for unsurpassed comfort. The material eradicates ulcers, provides fluid movement and is soft and forgiving on the foot. Rails: V-RAILHydro's patented V Rail Design creates more surface area to increase thrust. *Please note sizes shown are UK sizes, however the sizes on the packaging are US