Long traverses and big climbs call for the Arc'teryx Women's Skeena Zip Neck Long Sleeve Shirt. Utilizing two fabrics in its construction, this top is specifically designed to yield the highest level of performance when you're exploring above treeline. Arc'teryx's Crystalis fabric at the body is breathable, moisture wicking, and lightweight, so you feel free to push yourself as hard as you like, without running the risk of getting soggy with sweat. The shoulders are fitted with the durable Helius fabric, which wears hard and will handle abrasion from pack straps. A UPF rating of 50 throughout the shirt provides some extra protection from the sun, while strategically placed seams reduce the chance of pesky chaffing.