Adding manganese rails to the proven and iconic SLR creates the durable and comfortable SLR Boost TM Superflow. High-quality materials and a compact design bring a level of high performance to any endurance ride or race event. The neutral shape and Superflow cut-out of the SLR Boost TM Superflow allows you to move freely without compromising output. Finished with a polyurethane Soft-Tek, this saddle is one of the most enjoyable that you'll ever use.