Long johns, base layers, skivvies—there are many names for thermal underwear ... for high-output activity. Danny Perez is a Commerce Editor for Popular Mechanics with a focus on men's style ...

LET'S BE FRANK: Thermal underwear is arguably the least sexy type of underwear for men on the market ... thanks to its smart design and high-performance features. For starters, the fabric is ...

When you buy through our links, Business Insider may earn an affiliate commission. Learn more Your underwear collection doesn't have to be basic. Sure, we all need a basic black or white pair, but ...