Rena Behar is a journalist and editor focusing on tech, travel, and gender. She has contributed to Travel + Leisure, TripSavvy, and more.

So, unless you’re willing to brave the freezing temperatures without some much-needed buffering, the best thermal underwear needs to be included in your winter wardrobe. Whether you're prepping ...

Long johns, base layers, skivvies—there are many names for thermal underwear for men ... merino wool is considered the best base layer for its natural properties such as odor control, heat ...

Our top women’s long-underwear picks for all kinds of activities ... she swears by Patagonia’s Capilene thermals, which the brand calls its most versatile base-layer bottoms.

For the last few years, I’ve made it my life’s goal to find the best thermal underwear (both tops and bottoms) so I never have to suffer cold again even in the worst of winter. I’ve personally tested ...

Long johns, base layers, skivvies—there are many names for thermal ... underwear is warmer. Still, these are great for high-output activity. These lightweight men’s long johns are best suited ...

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 ...