The ATO – Alpine Terrain Operations™ Mid Loft Jacket is designed to provide warmth and wind protection when static while avoiding overheating during movement. Constructed with a durable wind resistant nylon fabric that is lightweight and packable. The Polartec® Alpha® Direct insulation is a uniquely constructed knit that does not require a lining layer, reducing the overall bulk but maintaining a high CLO value. The insulation is also highly breathable and designed to allow excellent ventilation during high activity in cold temperatures. Designed to fit over Crye Precision G3/G4 Uniform and ACLIMA® Baselayer Tops, as well as under the Compact Alpine Overwhites. Can also be matched with ATO Mid Loft Pant.