The ATO - ALPINE TERRAIN OPERATIONS™ MID LOFT PANT 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® 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. It features an adjustable waist, glove compatible zippers, and pass through hand pockets to access under layers. Full side leg zips for easy donning/doffing over boots. ¾ Length to allow a better fit when worn with ski boots and provide warmth at crucial areas of leg. It can be worn over the G3/G4 UNIFORM and Aclima® baselayer pants, and under any high lofted outer layer. Made in US from US materials.