Thermal clothing (also called long underwear) are the base layers that you wear under your regular clothes. Thermals are great because they trap body heat better than your jeans or men’s dress shirts when it’s incredibly cold. Sizing breakdown for UNISEX thermals- MENS XSMALL/WOMENS SMALL MENS SMALL/WOMENS MEDIIUM MENS MEDIUM/WOMENS LARGE MENS LARGE/WOMENS XLARGE MENS XLARGE/WOMENS 2XL
