Heat Holders Men's Lite Base Layer Top is a medium weight thermal base layer ideal for very cold days. Matching Bottoms also available.Features: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.100% Polyester1 PackMachine washable at 40 degreesImported Heat Holders Men's Lite Karl Thermal Long Sleeve Top