Lovebird Lingerie's Diamond Series Stay Warm even in -20* C Temperature. This thermal has a luxuriously soft hand feel, superior heat retention & moisture management properties for all day comfort. The updated brushed texture is now even softer. Soft, stretchy fabric packed with bio-warming, insulating, moisture-wicking, quick-drying, and shape-retaining comfort features. A warm layer with brushed 100% organic cotton on the inside. Turtleneck/Highneck design for extra warmth. Can be layered or worn as innerwear. No Bleaching, No Iron, Regular Washing