Merino wool has long been the standard bearer when it comes to high-performing fabrics for warm and versatile base layers. Sure, many brands have tried to sell polyester as the best, and bamboo ...

Hailing from New Zealand, Icebreaker have been championing the use of Merino wool and natural fibers ever since they launched their first line of base layers in 1995. Since then, they’ve grown ...

Base layers are what Icebreaker does best, and they’re always some of the top-performing designs when we test thermals each winter. Icebreaker’s merino layers are worth the spend, and will ...

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 ...