Kaohi Double Coil Calf Leash-Blue-6' x 8mm

The Kaohi Double Coil Calf Leash 6' x 8mm is a heavy-duty foil leash built for prone foiling, wing foiling, SUP foiling, and downwind paddling. Kaohi — a brand whose name translates to "control" — designs leashes specifically for foil-based watersports, and the Double Coil 8mm sits at the sturdier end of their lineup. This particular configuration pairs a 6-foot length with an 8mm cord diameter and a calf-mount cuff, keeping the attachment point higher on the leg and farther from the foil mast during riding.

The leash uses a patent-pending double-coil construction that addresses a common frustration with standard coil leashes: kinking and tangling. By winding the cord in two parallel coils rather than one, the design holds its shape over time and resists the self-knotting that can interrupt sessions. When riding above the water on foil, the compact coil stays elevated rather than dragging in the surface, reducing hydrodynamic interference.

• Length: 6'
• Cord diameter: 8mm
• Cuff style: Calf
• Cuff material: 2.0" neoprene
• Swivels: Marine-grade 316 stainless steel, double
• Closure system: Pro-Grip hook-and-loop
• Patent: U.S. Patent 10,737,750 B2 (Grip handle); Double Coil patent pending
• Available colors: Black, Blue, Neon Green, Orange, Pink, Red
• Also available in: 7' length

This leash targets intermediate to advanced foilers who ride in surf, open-ocean swells, or otherwise challenging conditions where a thicker cord provides added security. The 8mm diameter is noticeably beefier than the brand's 5.5mm option, making it a better match for riders on larger boards or in bigger waves where breakaway forces are higher. The calf cuff positions the leash above the ankle, which many foilers prefer because it keeps the cord farther from the mast and fuselage during water starts and touchdowns.

A distinguishing feature is Kaohi's patented Grip handle — a neoprene-wrapped rail-saver section that doubles as a grab point. It lets riders keep their board close with one hand between sets or in whitewater, leaving the other hand free for a paddle or wing. This is particularly practical in wing foiling, where managing both board and wing during lulls can be awkward.

Within the Kaohi range, the Double Coil 8mm is the heavy-duty option. Riders looking for a lighter, lower-drag setup can step down to the Double Coil 5.5mm, which trades some strength for reduced weight and a slimmer profile suited to calmer conditions and speed-focused sessions. Kaohi also offers the INVIZ Leash, a hybrid bungee-and-coil design that weighs roughly 4 oz — significantly lighter than a typical coil leash — and targets riders who prioritize minimal drag above all else.

Compared to conventional coil foil leashes from brands like Dakine or Ocean & Earth, the Kaohi Double Coil differentiates itself primarily through its two-coil anti-kink construction and the integrated Grip handle, both of which are patented or patent-pending designs. The 6-foot calf version reviewed here is also offered in a 7-foot length and with an ankle cuff for riders who prefer a lower attachment point.