This natural fiber is one of the best materials for trapping warmth. “My No. 1 recommendation for long underwear is merino wool,” says Sarah Savala, a gear expert and customer-care supervisor ...

These are the best merino wool clothing brands for soft, comfortable and stylish clothes. Overall, the #1 best wool clothing ...

Base layers keep you dry and warm outside. Merino wool base layers are the best you can buy. But what are they and why are ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Long johns, base layers, skivvies—there are many names for thermal underwear for men. But the main ...