VS saddles feature a 7mm channel design that allows for greater pressure relief, whilst maintaining the stiffness & durability of a solid-base saddle. The Tundra is intended for XC & marathon use. Its shape is flat in cross-sectional profile, with an average width. Its supreme comfort & low weight are sure to take your riding performance to the next level! The Tundra M5’s K:ium rail ensures this saddle is strong enough to withstand what you throw at it.