Whether we're touring the backcountry in chilly spring weather, projecting new routes at the crag on cool fall mornings, or hiking steep peaks where the weather at the top is suddenly 20 degrees colder, the Mountain Hardwear Polartec Power Grid Full-Zip Hooded Jacket keeps us warm and cozy during active pursuits. The mid-layer jacket's gridded fleece construction traps heat in its grooves, while still allowing excess heat to escape during periods of high output. The underarm gussets and stretch material allow us to move naturally, and the elastic hood and hem seal in heat while blocking out wind.