The ION Sonar Foil Seat Harness is built for demanding riders who want to get the most out of their foil at high speeds. Its design is based on the Radar model but comes in an even lighter build. The rigid shell elements deliver stability, while the flexible sections allow for a natural range of motion.
This model features the Spectre Bar 2 for optimal load distribution and a Lumbar Pad that supports the lower back during intense tacks and long sessions. Adjustable webbing connecting the leg straps to the bar keeps the hook in a low position, improving ergonomics for foil riding.
Practical extras include the C_30 Buckle with a lightweight carbon adjuster, a neoprene belt for enhanced comfort, and the integrated Kite_knife 2.0 multitool that works both as a safety knife and a tool for equipment adjustments. An additional leash attachment point (D-Ring) is placed next to the bar, with the option to switch sides according to preference.

Product highlights
LIGHTWEIGHT HYBRID CONSTRUCTION
Combines hardshell elements and flexible sections for solid support with unrestricted movement
SPECTRE BAR 2
Even load distribution for more comfort and control during foil riding
LUMBAR PAD SUPPORT
Extra cushioning for the lower back improves comfort during long sessions and under high loads
ADJUSTABLE LEG STRAPS
Smooth adjustment keeps the hook in a low position for better ergonomics on the foil
KITE_KNIFE 2.0 MULTITOOL
Integrated safety knife with Torx (TX20) and PH3 bits for strap and hook adjustments
Features

Lumbar_Pad
Provides extra cushioning to handle strong forces in foil racing better.

Spectre Bar
ION‘s latest innovation in spreader bar technology. Incredible flexibility and a slim outline. Including a lightweight aluminum hook

C_30_Buckle
Easy to handle carbon adjustment of the spreader bar webbings with a pleasantly light weight

Neoprene_Belt
A new and improved technical feature, designed to increase the feeling of flex, twist and overall comfort of wave and freestyle riding

Kite_knife 2.0 multitool
Multitool including double bit with 3/32 hex key and PH3, can be used for fins, foostraps & the modular hook system of ION's C_Bars

Leash D-Ring
Kite leash attachement point next to your spreaderbar. Enhanced safety and usability. Light and robust. The side can be varied depending on personal preference

- HPL_Slider - Stainless steel ring attached to the handle pass leash to connect to your safety leash – guarantees a smooth sliding of the latter
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