The Mountain Hardwear Women's Butter Zippity wicks moisture and keeps you cool during the most high intensity adventures. The lightness and buttery feel of this base layer makes it an appropriate choice during a wide range of activities from summer backpacking trips to cold weather powder days at the resort. As soon as you try on the super soft, moisture-wicking fabric it will be difficult to resort to anything else. By utilizing the thumbholes at the end of the sleeves you can throw on a another layer without bunching.