Radium 8The Radium 8 is an advancement of ION's best seller and convinces with ION's proven harness design. For further improvement of this model, ION added a unique 3D Curv_Spine. The high outline provides optimal back support. Additionally, the design features controlled stiffness in the center with flexible side parts, resulting in a perfectly balanced harness. With a flex index of 8, it is one of the medium stiff models in ION's product range and turns