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ION's 3D Fit Technology provides the perfect fit for each individual's body size and shape. Your individual fit derives from back length and waist circumference. Therefore the Sol Curv is available in regular and tall sizes. The exchangeable Ergo_Pad on the inside offers optimal lumbar support in two profiles (each harness comes with two options - medium and high support - choose what suits you best). The Sol Curv is medium rigid (flex index 11) and offers a good balance between direct feeling, flexibility, and support. An ultra-lightweight Curv construction distributes forces evenly throughout the harness. At the same time, it's flexible enough to allow for optimum freedom of movement.