100% Merino. 100% capable. Smartwool's Women's Merino Base Layer Bottom is always ready for what's ahead and what's next. With a fit updated to improve functionality while enhancing aesthetics for a range of body shapes and a flatlock seam construction designed to minimize chafing, comfort is never in question. Get yourself a pair or two of our best base layer pants and conquer the cold with more confidence than ever.

Smartwool Merino 250 Base Layer Bottom 

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Curating gear for diverse people of all walks of life pushing boundaries through the exploration of the outdoors.

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The Kari Traa Rose Boxer is a booty-covering, high waist short that&rsquo;s smooth to the skin, warm, wicks moisture, and keeps you dry. Made with three panel construction and a crotch gusset, these boxers allow enhanced movement. Underwear has never looked so flattering.

Rose Boxer - Women's

With low-profile seams to minimize bulk and maximize comfort, the fitted Women's Summit Series Pro 120 Tights are an adventure-ready, lightweight base layer made for any type of cold-weather exploration. DotKnit fabric helps manage moisture build-up, while a wide elastic mesh waistband makes for a comfortable fit when pushing the limits.

The North Face Summit Series Pro 120 Tight

Shredding dusty trails gets mucky, but we feel fresh with the Hannah Hot Pant Underwear as our base. The soft performance blend wicks away moisture and fights off odors, while the double layer inner-leg gusset holds strong against hours in the saddle.

Mons Royale Hannah Hot Pant Underwear

The Tahoe Boyshort Base Set is built to keep us cool, comfortable, and ready for any adventure. Whether lounging at the campsite or layering for an active day, the lightweight Tahoe Sun fabric wicks moisture, dries quickly, and provides UPF 50+ sun protection. With a soft, fitted waistband and a gusseted liner for next-to-skin wearability, this baselayer boyshort ensures all-day comfort.

Backcountry Tahoe Boyshort Base Set

The Smartwool Classic Thermal Merino Base Layer Crew - Women's is a Merino wool base layer for staying warm when exploring the cold. Ski days, hiking weekends, cold weather camping and so much more. This first layer keeps the heat in and comfort levels high. The slim fit allows for the easy addition of layers over top, while flatlock seam construction prevents chafing. The 100% Merino wool fabric breathes to prevent overheating, provides thermoregulation, and resists odors for a super comfy time outdoors.

Smartwool Classic Thermal Merino Base Layer Crew

Layer on the comfort with the new Women's Classic Thermal Merino Base Layer 1/4 Zip Plus. This must-have base layer features 100% Merino wool fabric, breathability, odor resistance, and a body-enhancing fit so you can explore comfortably and look good while doing it.

Smartwool Classic Thermal Merino 1/4-Zip Base Layer Plus

Everybody hates it. That stiff, distracted feeling you get when you're out in the cold. That's why, Under Armourbuilt a baselayer that keeps you warm and dry without being bulky or riding up, so you can stay focused all season long.

Under Armour Authentics Mock Neck Baselayer Shirt

Our shred-ready Backcountry Cedars RWS Merino Midweight 3/4 Baselayer Bottom is the perfect partner for our knee-high socks and snow-sport boots. The shorter silhouette limits the amount of friction and pressure we feel while layering without limiting our warmth and comfort on-mountain. Crafted with Responsible Wool Standard-certified merino wool, these techy tights resist odor buildup, wick moisture, and regulate body temperature throughout our ski sessions.

Backcountry Cedars RWS Merino Mid-Wt Baselayer 3/4 Bottom - Women's

We reach for the 185 Rock/N/Wool Top for heading to the mountain or out on the town, thanks to its modern design. Unlike turtleneck baselayers of old, this chic top blends in for athleisure scenarios, while the merino wool offers the high level of performance we&rsquo;ve come to expect from Ortovox.

Ortovox 185 Rock'N'Wool Long-Sleeve Top - Women's

Cardio in the cold? Layer up with the Smartwool Intraknit Active Long-Sleeve Baselayer Top. Whether we're running through a frosted wonderland or hoofing it up the skin track before finding fresh lines, the techy combination of merino wool and Tencel keeps us comfortable, insulating in the cold and cooling during our workout. Mesh Intraknit ventilation ups breathability for greater comfort, and chafe-free design lets us move to our hearts' content.

Smartwool Intraknit Active Long-Sleeve Baselayer Top - Women's

No more adjusting your bottoms as you plunge in and out of the surf. Sleek bottoms with a grippy lining, so they stay right were you want them.

Keep your essentials handy while you run, jump, and do waaay too many burpees. This bra has your back...and your front. Pockets on the side are large enough for small items, like your keys and cards, and a pocket on the back holds your phone securely. Compressive support reduces bounce while maintaining flexibility for comfort during hard runs, and wicking fabric keep you cool when you start to heat up.

Smartwool Merino 250 Base Layer Bottom

Baselayers & Undies - Women

Rose Boxer - Women's

The North Face Summit Series Pro 120 Tight

Mons Royale Hannah Hot Pant Underwear

Backcountry Tahoe Boyshort Base Set