Designed for mountain pursuits that increase your heart rate and your motivation, the Dawner's performance is matched only by its go-all-day comfort. The secret? An interior fully lined with silky-soft Octa(TM)? insulation. Constructed in a slightly raised diamond grid pattern that holds in heat while allowing sweat to evaporate, it feels soft on skin and slides smoothly over a tee or baselayer. For mobility, the durable stretch outer moves with you and allows sweat to escape, with a DWR finish that sheds light precip. It can compress into one of its own lined, zippered hand pockets for easy stashing in a running vest or summit pack.