The Arc'teryx technicalLong Sleeve Ether CompCrew delivers exceptional moisture transport, ventilation and comfort for extended use on the trail. Helius™ polyester fabric on the body wicks moisture and feels like silk next to the skin. Surprisingly durable for its weight, Helius™ offers UPF 50+ sun protection and stretch performance. Arc’teryx carefully designed the Ether for the realities of the trail. Gusseted underarms combine with the fabric’s stretch to elevate ergonomic performance, and the Athletic fit stays close to the body to improve moisture transport without sacrificing freedom of movement.Flatlock construction all but eliminates seam irritation. And, at a mere 175g, it is easily packed.