KSO Harness Profile
ION Sonar
2025The racing evolution of the Radar
Foil / RaceFreerideIntermediateAdvancedPro
Brand
ION
Type
Seat
Shell
Hybrid
Sizes
S – XL
KSO Editorial Scores
The same ten characteristics, scored 1–10 for every harness in the index — comparable across all brands. How we rate →
Data checked: July 2026
Back support9/10
Locked-in fit9/10
Freedom of movement5/10
Pressure comfort8/10
Spreader options7/10
Durability8/10
Lightness7/10
Drainage6/10
Ease of use7/10
Stiffness7/10
Preliminary editorial scores — final confirmation pending.
Model years
Sizes & RRP
SMLXL
Available
About this harness
The Sonar is ION's performance seat harness: an evolution of the Radar tailored to foiling and race-foiling, with a deliberately low profile that drops the centre of load transmission where racers want it. Partly Curv construction stiffens force distribution and back support — the seat harness as a performance instrument.
About ION
ION
ION
ION is a watersports brand offering wetsuits, harnesses, impact vests, apparel and bags.
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