Conquer unpredictable shoulder season weather with these Merino wool base layers.

By trapping heat and wicking away sweat, the best base layers are a cheat code to staying warm when you bundle up, so we tested 15 and found three winners.

Testing the absorption capacity, water retention, and drying time of wool, synthetic, and cotton shirts. Wool as strictly a winter layer is an old idea. “‘Wool is warm’ is a 1960s perception,” Dr.

Our product picks are editor-tested, expert-approved. We may earn a commission through links on our site. Why Trust Us? With a few of these editor-approved knits, you can spend all winter being cozy ...

When it comes to base layers, the main choice is whether you want a synthetic (usually polyester) layer, or a natural fiber like Merino. Historically, Merino has been heavier and held moisture longer ...