For reliable comfort at your very first layer, here's a go-to choice. Cut to fit your curves, this Smartwool Merino Lace thong breathes, wicks moisture, regulates temperature and resists odor.

briefs

Whether you twist it, flip it, fold it or just slip it on, the Buff Merino Lightweight multifunctional neckwear will keep your head warm and protected during cold-weather activities.

headbands

Delivering true 4-season comfort for year-round outdoor play, the kids' Buff Merino Lightweight multifunctional neckwear is soft, warm, wind-resistant, lightweight and wearable 10+ ways.

headbands

A naturally technical fiber, merino wool resists odors and regulates temps, making the men's On Merino Long-T shirt an outdoor essential at any time of year—it's perfect for hiking and everyday wear.

hiking-shirts

Naturally technical, merino wool regulates temps and resists odors, making the women's On Merino Long-T shirt an outdoor essential at any time of year—it's perfect for hiking and everyday wear.

t-shirts

Ideal for cold weather, the kids' REI Co-op merino midweight base layer bottoms are soft—not scratchy—naturally regulate temp and made with wool that's certified to the Responsible Wool Standard.

base-layer-bottoms

Oh so soft and not itchy, the kids' REI Co-op merino midweight base layer top is an ideal first layer for cold weather. It naturally regulates temp and is certified to the Responsible Wool Standard.

base-layer-tops

Made from supersoft, cruelty-free merino wool, the Buff Merino Move multifunctional neckwear is naturally odor-resistant and will keep you cozy from street to summit.

headbands

Be ready for unpredictable spring conditions with the Smartwool Merino neck gaiter. Its extended length helps protect you from the elements, whether you're on the ski slopes or out for a hike.

neck-gaiters

Made for winter layering, the women's Icebreaker Merino Oak jacket is crafted in felted merino wool and offers a relaxed, modern silhouette.

casual-jackets

Your underwear should deliver lasting comfort. Whether you're spending the day at work or a couple hours at the gym, Smartwool Merino Plant-Based Dye boxer briefs help you stay confidently comfy.

boxers

Great for snowshoe adventures or summertime hikes, the Smartwool Merino Plant-Based Dye neck gaiter has got you covered to help keep you cool on hot days and warm on cool ones.

neck-gaiters

Purpose-built for comfort that lasts all day, the women's Smartwool Merino Plant-Based Dye T-shirt is versatile enough to be worn on its own or with weather-appropriate layers.

t-shirts

A wide, merino-lined elastic waistband and flatlock seams help make Smartwool Merino Print boxer briefs your new favorite for any activity—from urban exploration to new trail adventures.

boxers