The Romin Evo Pro is stiff & contoured to position the rider for optimal power transfer & comfort while its extra-wide channel maximises blood flow. Patented Body Geometry design is lab tested to assure blood flow to sensitive arteries Stiff carbon reinforced shell tuned for ride compliance Tuned-density EVA foam padding is lightweight & supportive Ultra-light & strong oversized FACT™ carbon rails Tough light & water resistant Micromatrix™ cover Available in sizes 130/143/155 > NOTE: Oversized 7x 9mm carbon rails are not compatible with seatposts equipped with side-load clamp mechanisms for 7mm round rails