Serfas RX Saddles are designed to increase blood flow and alleviate numbness Serfas RX designed saddles have a full length anatomical groove down the middle of the saddle along with an elevated seat position. This has proven to eliminate pressure and significantly reduce numbness around your soft tissue (plumbing) and put weight where it belongs—around your sit bones. This means you can spend more time in the saddle without sacrificing comfort.  Dual Density Base with new Twin Bar Design Patented ICS Comfort System Best protection against numbness Steel Rails, Weighs 485 grams Waterproof, Breathable Microfiber Cover 234mm X 178mm