The Keystone Jacket is designed with the classic Colorado shoulder season ride in mind. Imagine your morning rollout in the mid 30’s, by lunchtime you're faced with temperatures in the 60’s, and the entire course of the day you've encountered mountain ascents/descents that expose you to extremes at either end of that spectrum (and probably some rain too!). The Keystone is extremely effective at regulating your temperature while being light enough to wear through the entire effort. And if you tend to run hot during exertion, we've included a reflective two-way zipper so you have venting options. Three full-size rear pockets and a fourth zippered security pocket allow you to stow everything you may need for an all-day ride.