Winter weather undershirt Seamless (flat seam) technology Thumbholes on sleeve cuffs High breathability Provides outstanding warmth without compromising on moveability Lightweight Made of quick-drying (Helikon Comfort Dry) material Material: 95% Polyester, 5% Elastane Manufacturer: Helikon Manufacturer's number: BL-UN2-PO Helikon Underwear Top US Level 2 Black