Long underwear bottoms got their illustrious start with what used to be called "long handle underwear" that miners and farmers used to wear in very cold weather. These days, women's long underwear has taken on space-age technical properties like silky microfiber yarns, moisture wicking, compression fits to support fatigued muscles and flat-lock seaming to help prevent chafing. Antimicrobial knits deliver odor control to keep you fresh and fragrant. Temperature regulating fabrics help keep you from the cold whether you're snuggling into your bed or braving the icy great outdoors. These bottoms are generally leggings that taper at the ankle to seal out drafts. Also known as base layers, long underwear bottoms are extremely functional as well as fashionable.