FCS Surfboard Leashes - FCS Regular Ankle SUP Leash - 7ft 0 :: Unisex > Surf Accessories. Length: 7ft 0Machine stainless steel swivelsWave Size: 2 - 8ft and flat waterPerforms to the highest standard in a wide range of conditionsDurable polyurethane cord provides the ultimate in strength. stretch and elasticityCord Thickness: 7mmInterchangeable smooth rotating nylon cuff and swivel assembly Size: one size.