The Sitka Gear Ascent Shirt is designed for those warm early season hunts. The weave of the Sitka Gear Ascent Shirt and flip-up collar provides a physical 29UPF barrier. Hunters have struggled to find a technical hunting shirt for hot weather often relying on their base layer to fill this need; and most base layers are not optimized to be worn as outerwear because they lack the durability and UPF protection needed for early-season hunts.