This midweight top is the ideal base layer when it's cold out. Made of Polartec Power Stretch, a fleece with two different faces, the fuzzy interior wicks moisture away from your body while the smooth exterior disperses that moisture, resists abrasion and glides easily against whatever you layer against it. The zip tee styling provides custom ventilation as you need it, and the fabric's four-way stretch feels unrestrictive as you move.