The latest addition to ION's Ergo_Concept, the Radium is the perfect harness for every windsurfer who's looking for flexibility combined with good back support.With a flex index of 8, it belongs to the medium rigid harnesses. Flexible side parts and an internal flex belt allow for good mobility. With a flex index of 8, it belongs to the medium soft harnesses. Developed with the rider's health in mind, the Radium features an exchangeable Ergo_Pad on the inside. The pad is characterized by its integrated channel, different thicknesses and elevated trigger points on the outside. These prevent lower back injuries, reduce pain and increase comfort. Both pads are included and attached with a very robust velcro. Just try both and go with the one you feel more comfortable with. The 3D_Plus spine reinforces back support. The result is a sound balance between freedom of movement and support through a high outline. The harness comes with a lightweight thanks to the partly Curv construction, non-water absorbent HD_Foam, and the sleek Spectre Bar (windsurf hook included). The Curv_Flaps of the Spectre bar create a seamless and optimal force distribution throughout the harness.