Heat Holders® Men s ULTRA LITE™ Base Layer Top is a light weight thermal base layer ideal for everyday cold. Matching Bottoms also available. DUAL BRUSHING Supersoft HeatWeaver® yarn is carefully brushed both inside and out to maximize warmth and softness. PERFECT STRETCH Our knitting technology and attention to detail produce the perfect stretch for freedom of movement and fit. FLAT COMFORT SEAMS Our carefully finished flat seams minimize bulk to create a comfortable non-chafe fit perfect for layering. MOISTURE & ODOR MANAGEMENT Moisture and odor management technology helps keep you drier fresher and more comfortable. 84% Polyester 16% Elastane 1 Pack Machine washable at 40˚ Imported.