100% Polypropylene. Imported. Machine Wash. Lightweight, 5.5 oz 1X1 rib knit for comfort. Moisture wicking, quick drying. Tagless. Rib cuffs for added protection from cold. Rated for cold weather and high activity. Wicks Moisture. 1x1 Rib Knit. Soft Rib Knit For Comfort. Rated for Cold Weather High Activity.