As someone who loves the winter, I’ve had my fair share of borderline-frostbitten toes, but ever since I discovered the merino wool base layer, I’ve been able to stay out longer than ever.

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 ...

Like the socks this brand built its reputation on, the Smartwool Merino 150 base layer uses Merino wool – a material that's often used for outdoor apparel, being breathable yet warm, and ...

BREATHABLE: Keeping you cool in summer and warm in winter, MERIWOOL’s 250g/m2 weight interlock-knit Merino wool can be used as a base layer or mid-layer, but won’t weigh you down. COMFORTABLE ...

Staying cozy throughout the ski day (and into the après hours) can be hard work, but Artilect’s Flatiron base layer bottoms do the trick and then some. These use a new type of merino wool material ...