Base layers keep you dry and warm outside. Merino wool base layers are the best you can buy. But what are they and why are ...

Fortunately, we’ve got an easy trick to tell which merino wool base layer is right for you. Merino wool base layers, also known as thermal underwear or long underwear, come in various weights ...

(Honestly, the only thing that keeps it from being my go-to base layer to this day is the fact that mine is purple and just doesn’t go with much.) Made with 100-percent merino wool, it’s a ...

From natural temperature-regulating fabrics like Merino wool to synthetic options engineered to wick moisture, today’s base layers are marvels of technology. Our test crew put 50 items through ...

Good base layers should be formfitting — not tight but not loose — in order to retain heat. They are often woven from merino wool or technical synthetic fabrics that also have moisture-wicking ...

but the best base layers are made with a percentage of merino wool (though, they will be pricier). Merino is very warm but still highly breathable and is great at wicking away sweat. It also has ...

Wool is exceptionally lightweight ... Smartwool's Intraknit Thermal Max Merino base layer has the insulation and breathability you need for maximum warmth. As the name suggests, Max garments ...