Designed to keep you warm in the coldest conditions, this is a versatile pair of Merino wool bottoms They’ll also hold up to extended wear and the occasional snag much better than lightweight options. Heavyweight

A great synthetic thermal long underwear at an unbeatable price for the warmth and durability they provide

Analysis and Test Results

High-grade base layers should simultaneously provide enough warmth in frigid temperatures, while staying dry and airy despite heavy sweating. Why use long underwear? Concerns regarding outside temperature, in some ways, are still guided by how you’re exerting yourself. You tend to be much more resilient to the cold if you’re working hard, and likely to cool off considerably as soon as you stop charging. These concerns aside, there’s no doubt that the demands you put on your gear scale consistently with how cold it is outside.

You might opt for midweight long johns as something to wear around the fire when fall camping. Patagonia Capilene is a great thermal underwear for this. Smartwool has a large selection of top-tier base layers to choose from. The Smartwool Classic is an excellent choice for anyone, and we chose it as the best overall due to the fit, comfort, and range of motion available with the materials. They used to be made from 100% Merino, and the nylon core changed the overall feel of the leggings. Note: Smartwool still has products made from 100% Merino if the feel of these isn’t quite right. These Smartwool base layers were comfortable to wear while hiking, camping, and playing with my pup. Meg Carney Long underwear, colloquially known as “long johns” are the bottom component of what is now referred to as a “base layer”. Bringing a “best of both worlds” attitude to the table, blends tend to be among the most expensive and performance oriented options out there. Pros Because of their extreme insulative properties, these thermal underwear won’t breathe at all, and any amount of prolonged exertion is likely to result in an uncomfortable sweaty mess.

These may be your best option if you’re looking for something to lounge in, what immediately comes to mind is sitting on the sidelines of a football field in late October, long after the sun has set. Extreme Variations