We tested a mix of 12 wool and synthetic base layers to see which are guaranteed to keep you warm when temperatures drop. Two emerged as must-haves for this winter.

The best cycling base layers can help keep us warm and comfortable on the bike in winter. In warmer summer weather they can also help keep us dry and deal with moisture. When worn under one of the ...

Midweight layers can also be worn under fleece jackets or heavier base layers in extreme cold. Heavyweight For very cold days, you want a base layer around 260+ gsm to give you maximum warmth.

Base layers suggest clothes that at least have the potential to be seen by others, while also implying some sort of hiking-skiing-climbing association.

Base layers — long underwear — are capable of adding considerable warmth. So, layering a pair under your jeans for a winter commute will help keep you warm.

We sent 13 testers out to hike, ski, shovel snow, and run. And we found base layers, in a variety of styles and fabrics, that will keep all types of bodies warm.

In this article, we'll break down base layer weights and share a nifty trick to help you choose the right layer weight for your outdoor needs. The post This easy trick tells you which merino wool ...