The XM is an updated version of the Gobi, still featuring Wingflex sides & a Tailflex rear section to absorb shocks & allow smoother transitions in & out of the saddle, but now with an enhanced dip platform for off road climbing comfort & supplied with Fizik's Kium rails instead of the usual titanium, saving an extra little bit of weight. Perfect for XC marathon & endurance events. Foam/ Wingflex cushioning Hard wearing cordura scuff guards Microtec cover Kium Rail 285x 130mm 230g