♦Thermal underwear is excellent comfort and warmth in cold weather. ♦Stretchy elastic and lightweight design for style and function. ♦Underwear is elastic - provides perfect fit. ♦All seams are flat-lock for high comfort when wearing - eliminates rubbing and pressing with seams. ♦Top with crew neck and long sleeve has inserts of breathable perforated tissue, providing additional thermo regulation. ♦Hypoallergenic - is less itchy and irritating than regular underwear. ♦Can be worn either as standalone or in combination with other layers of thermal clothing, allowing you to achieve perfect level of comfort and thermal regulation.