This stiff saddle features a FACT™ carbon fiber shell tuned for racing and contoured to position the rider for optimal power transfer and comfort. Its extra-wide Body Geometry channel maximizes blood flow. The Romin is the saddle of choice for World Time Trial Champion Tony Martin. Patented Body Geometry design is lab tested to assure blood flow to sensitive arteries Stiff FACT™ carbon fiber shell tuned for support and ride compliance Super-light PU padding for comfort and support on longer rides Ultra-light and strong oversized FACT™ carbon rails Tough, light and water resistant Micromatrix™ cover Level 1 padding: Lightest level of padding; most direct connection to the bike Size 143mm/ Weight 158g Size 155mm/ Weight 165g Size 168mm/ Weight 173g NOTE: Oversized 7x9mm carbon rails are not compatible with seatposts equipped with side-load clamp mechanisms for 7mm round rails