SKINS C400 compression baselayer tops have been specifically designed to meet the physical demands of cycling. Based on 400 key fitting points, items in the SKINS C400 range are cut for on-bike comfort & enhanced core body control & power, as well as less post-exercise muscle soreness. In addition, SKINS C400 is the only high performance range to use in-motion measurement to define the correct level of compression needed during activity. This helps get more oxygen-filled blood to your muscles & reduces lactic acid build-up. So you'll have the power & strength to conquer the col du Tourmalet on the steepest side.