Thermal underwear (formerly known as “long johns”, now elegantly called “base layers” or “thermals”) can be an absolute lifesaver. Throw them on under a pair of sweatpants or winter-weight jeans to ...

Long johns, base layers, skivvies—there are many names for thermal underwear for men. But the main purpose of these cozy tights is the same no matter what you call them: they retain heat and ...