From a merino wool base layer to viral HEATTECH fabrics, these thermals provide extra warmth without the added bulk.

When you buy through links on our articles, Future and its syndication partners may earn a commission. It’s warm, cozy and doesn’t absorb odors, meaning it’s more pleasant on those longer multi-dayers ...

From viral finds like UNIQLO's HEATTECH or affordable styles with thousands of reviews like Cuddl Duds' fleece-lined sets, we found the best thermal layers for any upcoming (or current) snowy days.