Serfas Tailbones Comfort Bicycle Saddle w/Cutout - TB-15UC 90-Day Comfort Guarantee on all saddles Patented I.C.S. Infinite Comfort System RX & Deep Groove designs Dual Density base technology Anatomical cut out for comfort and breathability Infinite pressure relief foam creates a comfortable ride Flexible relief areas in base of saddle Steel rails, Lycra cover 267mm X 171mm