Now available in 2 widths, 142mm and 152mm, to provide the perfect fit for more riders, regular and large. Use the Spine Concept Evo system to find your perfect fit. The Antares is one of fi'zi:k's 3 Spine Concept Men's Road Saddle shapes. Of these 3, the Antares shape is wide and slightly curved in profile. The Antares R1 is for The Chameleon: Medium Spine. If you have an intermediate degree of spinal flexibility (approximately 90 degrees between your straight legs and your back when bending over as far as you can, keeping your legs straight a shoulders' width apart), you are a chameleon. Your degree of spinal flexibility helps you so far, before you need to rotate your pelvis slightly to achieve fully the performance position. You will benefit from the increased width and slight curvature of the Antares shape. Shell: Carbon Thermoplastic Composite with Wing Flex for freedom of thigh movementRail: fi'zi:k kium Cover: MicrotexThigh Glides: MicrotexIntegrated Clip System: YesLength: 275mmWidth: 142mm (regular) / 152mm (large)Weight: 200g (regular) / 205g (large)