Serfas Tailbones Cruiser Comfort Bicycle Saddle - TB-40C 90-Day Comfort Guarantee on all saddles Patented I.C.S. Infinite Comfort System RX & Deep Groove designs Dual Density base technology Rear spring suspension for added comfort and shock absorption Infinite pressure relief foam creates a comfortable ride Flexible relief areas in base of saddle Steel rails, Lycra cover 267mm X 171mm