If youre a Chameleon & want the perfect blend of performance, value & stiffness then the Antares R3 Kium is for you. With its lightweight Fibreglass Composite construction that weighs in at a total weight of 185g while offering incredible stiffness & Wing Flex sides that help to reduce rubbing the Antares is perfect for putting the power down. Spine Concept Fiziks guideline to choosing the perfect saddle, Spine Concept offers three different versions depending on varying degrees of flexibility to create a comfortable, high performance riding position. The Fizik Antares R3 K:ium is designed to fit Chameloens.