An evolution of their Traverse mountain biking short, the XC version streamlines the original design with a lighter, slimmer cut that's also much more ventilated. The technical design features an integrated waist belt that you can adjust with just one hand and the stretchy, mil-spec fabric gives you that freedom of movement you'll want in a mtb short. The shorts are also water repellent and have two low-profile cargo pockets for storage. 

$165, missionworkshop.com