I know the phrase “wool underwear” conjures a mental image of some lumberjack from the 1800s with hair growing through the weaves of his itchy, hot long johns. (I also live in Portland, Oregon ...

Recently, merino wool has been incorporated into undershirts. Wool may seem like a bad idea at first, but if it's knitted loosely enough to breathe well and use the right wool, like fine merino ...

As you shop for your own thermal underwear, there are a few things you should keep in mind, including the underwear’s fabric weight and, when it comes to Merino wool, the temperature rating.

• Best merino wool underwear: Icebreaker Women’s Merino 150 Siren Bikini and Unbound Merino Boxer Briefs for Men • Best merino wool bra: Branwyn Essential Bralette ...

Merino wool base layers, also known as thermal underwear or long underwear, come in various weights, typically categorized as ...

The best thermal underwear is often made from materials like merino wool, synthetic fibers (like polyester or polypropylene), or a blend of both. Merino wool is always a favorite.

Merino wool base layers are the best you can buy. ... Think long underwear and socks. After that, you’ll wear an insulating mid-layer followed by a rain or wind-resistant outer shell.