Companies typically make thermal underwear from wool, synthetic material, or a blend of the two. And depending on your activities, some might be better suited than others for specific outdoor adventures. Other than a pair of the best hiking shoes, a great pair of thermals might be the most important piece of gear you buy for outdoor activities in the cold. Wool This Meriwool 100-percent merino wool henley makes a great versatile thermal for your camping layers. It’s warm enough to layer for colder temps, yet breathable enough to wear as a standalone piece. Thermals should have a tight fit because they pull the sweat away from your skin and release it throughout the fabric. This process keeps you dry and works to promote warmth and encourage heat retention. It’s also important for thermal underwear to fit tight, so there’s no excess space for air to move between them and your skin. Why Trust Outdoor Life?

With a mixture of styles to choose from, our selection of men’s underwear comes in sizes ranging from small to XXXL. We even have big and tall options, too. So, no matter what fit you prefer, you’re guaranteed to find the ideal underwear here. Brilliant boxersThermal underwear is a must for cold weather activities. Period. I can’t stress it enough. I’ve been camping, hiking, skiing, and working in cold temperatures for years and only rely on the best thermal underwear for men to keep me comfortable, warm, and dry. Not only will they keep you warm, they’ll keep you outdoors longer, so you can keep enjoying your favorite outdoor activities even when the mercury drops. Being comfortable is key to keeping you happy. But comfort starts with the first layer you put on in the morning. Our selection of men’s underwear is designed to keep everyone comfortable, regardless of your preferred underwear type, while also adding a little style to your underwear drawer. A comfortable fit The waistband of your underwear poking out over your jeans was, for a long time, as important to a Saturday night outfit as your Vivienne Westwood shirt being properly ironed. It was a signifier. ‘I wear Calvin Klein underwear. I am sophisticated.’ Maybe boxers aren’t for you. If they’re not, there’s no need to worry as you’ll find a selection of briefs to choose from too. Coming in classic Y-front and fashion designs, these are made to keep you comfortable wherever you go. Stay warm

Prior to that, in the early nineties when jeans were worn bum-cheek low, the right underwear wasn’t so much an item of clothing as an accessory. Old hat or not, there’s no doubt that men still have their ‘best boxers’, the ones they keep for special occasions. And, invariably, they’ll have a designer’s name on their waistband. We say, if wearing them helps you feel 100 per cent, embrace it. The Best Men's Underwear Brands

When it comes to that drawer, boxers will probably be king. Offering super comfort in a variety of guises, you’ll find boxer styles here to suit all. From hipster and stretch hipster to loose-fit boxers, woven designs, stretch keyhole and button front, you’re sure to find a pair for you. Keep it brief

Origin is not the company to buy from if you’re looking for cheap clothing. All the stuff they make is expensive, but that’s because they make everything in the USA with homegrown materials. I started wearing their jeans last year, which cost as much as these base layers, and was impressed with the quality. So I started getting more pieces from Origin, and among my favorites are the base layers. You could argue that your first layer is the most important because it’s not the one you’ll be shedding throughout the day. So it has to work or you’ll be miserable. That’s been my experience with the Nano Wool Base Leggings. Like a blue collar American, they just work. From long hikes to long sits, they’ve breathed better and kept me more comfortable than other base layers I’ve used.—Scott Einsmann Read Next: Why Don’t More Hunting Companies Manufacture Camo in the United States? Things to Consider Before Buying Thermal Underwear for MenThe Pnuma ICONX heated base layers are tight-fitting and functional as a general base layer without the heat, but they feature carbon-fiber heating elements strategically placed for maximum warmth. The heating elements are powered by a single rechargeable lithium battery that can double as a power bank. The shirt and pants each use their own battery. Thermal underwear should be skin-tight to keep you warm. Consider thermal underwear brands that offer a slim profile vs a baggy one. The fit should be comfortable but not too loose. If your thermals fit loosely, they won’t keep out air or warm you as adequately as they would with a tighter fit. Cost