Nike Therma-FIT is a double-brushed microfiber fleece that retains energy and resists heat loss. Nike Therma-FIT provides maximum insulation from cold and wind with minimal weight and bulk. It is ideal for any cold weather activities that require insulation. Nike Therma-FIT can be worn alone or as part of a multi-layering system, so when temperatures drop, workouts donÕt have to. Machine or hand wash in cold water. Do not bleach. Do not dry clean. Do not iron. Tumble dry low.