FCS Surfboard Leashes - FCS Big Wave Calf SUP Leash - 7ft 0 :: Unisex > Surf Accessories. Big wave specific performance and strength. designed to match the demands of big\n wave surfingWave Size: 2 - 10ft and flat waterExtended overmould keeps coil away from feet and prevents tanglingExpandable coil allows unrestricted movementDurable polyurethane cord provides the ultimate in strength. stretch and elasticityCord Thickness: 8mmMachine stainless steel swivelsInterchangeable smooth rotating nylon cuff and swivel assemblyLength: 7ft 0 Size: one size.