Designed to position the rider for optimal power transfer & comfort; its Body Geometry channel maximises blood flow. Patented Body Geometry design is lab tested to assure blood flow to sensitive arteries Stiff carbon-reinforced shell for longevity & all-day riding efficiency Lightweight & supportive PU foam for increased comfort over longer rides Ultra-light & strong oversized FACT™ carbon rails Tough light & water resistant Micromatrix™ cover Sizes available 130mm 143mm 155mm & 168mm NOTE: Oversized 7x 9mm carbon rails are not compatible with seatposts equipped with side-load clamp mechanisms for 7mm round rails