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

A good merino base layer might be an investment, but it's certainly worth it for its temperature-regulating, moisture-wicking properties that keep you comfortably warm and dry. Whether you're an ...

"I sat in 15-degree temps…stayed warm, comfortable, and dry." ...

A good merino base layer might be an investment, but it's certainly worth it for its temperature-regulating, moisture-wicking properties that keep you comfortably warm and dry. Whether you're an ...

Smartwool's Merino 150 base layer is designed to help keep you comfortable through all kinds of adventures. Here's our review When you purchase through links on our site, we may earn an affiliate ...

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 ...

Merino wool has dominated the outdoor base layer market, setting the bar for warmth, breathability, and temperature regulation. Although merino has long been considered the best base layer material ...