Icebreaker BodyFit150 Atlas T-Shirt - Short Sleeve - Women's

Go for a trail run or a hike in your merino wool Icebreaker Women's BodyFit150 Atlas Short-Sleeve T-Shirt. The lightweight Atlas T-Shirt transports sweat away from your skin and helps regulate your body temperature.

Arc'teryx Rho LTW Zip Top - Women's

Soft, itch-free merino wool makes the Arc'teryx Women's Rho LTW Zip Top warm and comfortable on chilly days. This all-natural top insulates in a wider range of temperatures than a synthetic shirt.

686 Spirit Riding Jersey Sweatshirt - Women's

686 Illusion Top - Women's

Patagonia Capilene 2 Zip-Neck Shirt - Long-Sleeve - Women's

Stay cool in summer and warm in winter with the lightweight Patagonia Women's Capilene 2 Zip-Neck base layer.

Arc'teryx Rho LT Zip Neck Top - Women's

An Arc'teryx Women's Rho LT Zip Neck Top serves as an ideal foundation for backcountry travelers, with a tailored stretchy fit that caters specifically to the backcountry lady.

Patagonia Capilene 1 Scoop Neck Shirt - Long-Sleeve - Women's

The Patagonia Women's Capilene 1 Long-Sleeve Scoop-Neck is a silkweight base layer you'll wear all year.

Patagonia Capilene 2 V-Neck Top - Long-Sleeve - Women's

The Patagonia Women’s Capilene 2 Long-Sleeve V-Neck Top preserves warmth as the temps drop.

Stoic Merino Bliss Shirt - Long-Sleeve - Women's

With its soft, naturally odor-resistant 17.5-micron Merino wool knit and ½ neck zip, the Stoic Women's Merino Bliss Lightweight Top covers you in functional comfort, minus the synthetic funk factor.

Stoic Merino Crew Shirt - Long-Sleeve - Women's

Toss all your synthetic base layers in the trash and opt for the funk-fighting, moisture-managing Stoic Merino Crew Shirt this season.

The North Face XTC Lightweight Crew Long Underwear Top - Women's

Your friend was impressed with what the bamboo fibers in The North Face Women’s XTC Lightweight Crew Long Underwear Top did. So she collected the bamboo plant off her work desk and made a shirt out of it. Frankly, her shirt looks pretty uncomfortable.

Icebreaker BodyFit 200 Oasis Crew - Long-Sleeve - Women's

Superfine merino wool is the secret to the advanced performance of the Icbreaker BodyFit200 Oasis Long-Sleeved Crewe for Women.

The North Face XTC Lightweight 1/4-Zip Long Underwear Top - Women's

The North Face XTC Lightweight ¼-Zip Long Underwear Top does everything in its power to help regulate your body temperature and handle odor while you hike, ski, and climb.

Icebreaker BodyFit 200 Chakra 1/4-Zip Top - Long-Sleeve - Women's

Icebreaker makes the BodyFit200 Chakra ¼- Zip Top for Women from superfine merino wool, and the result is everything you could want in a long-sleeved base layer top.

Mountain Hardwear Power Stretch Zip Top - Long-Sleeve - Women's

Why do I need the Mountain Hardware Women’s Power Stretch Long-Sleeve Zip top, you ask?

I/O Bio Merino Contact Long-Sleeve Zip Top- Women's

Women who love to challenge the elements will stay warm, dry, and oh-so-fresh wearing the I/O Bio Women’s Contact Long-Sleeve Zip-Top.

Icebreaker SuperFine140 Tech Lite T-Shirt - Short-Sleeve - Women's

Wool in summer? Hell yeah. Pull on your Icebreaker Women’s SuperFine140 Tech Lite T-Shirt to trail run or tour a muggy city.

Icebreaker Nature 150 Sweetheart Top - Long-Sleeve - Women's

With a low neckline, pigment print, and slim fit, the new Icebreaker Women's Nature Ultralite SweetHeart Long-Sleeve Top has style you rarely find in long underwear.

Marmot Lightweight Crew Shirt - Short-Sleeve - Women's

The Marmot Women’s Lightweight Crew Shirt wicks moisture and fights odors from the ski hill to the mountain trails.

I/O Bio Merino Contact Crib Top - Long-Sleeve - Women's

Welcome the sun back to the mountains and put on the I/O Bio Merino Women’s Contact Crib Top.

SmartWool Lightweight V Top - Women's

Pull on your SmartWool Women's Lightweight V Long Underwear Top before you pitch your tent and make dinner.This lightweight base layer keeps you warm as the sun sets at your base camp.

Icebreaker Nature Ultralite Sweetheart Top - Short-Sleeve - Women's

When you need a bit of extra warmth while in the mountains, bring the Icebreaker Women's Nature Ultralite Sweetheart Top.

Patagonia Merino 1 Crew - Long-Sleeve - Women's

Patagonia used a smart blend of merino and recycled polyester fibers to create the Women's Merino 1 Long-Sleeve Crew.

SmartWool Microweight Zip-Top - Women's

Even when the sun shines and the temperatures spike, you need a layer like the SmartWool Women’s Microweight Zip-Top.

Patagonia Capilene 1 Graphic Scoop Shirt - Long-Sleeve - Women's

From sunrise surf sessions to afternoons at the crag, the Patagonia Women’s Capilene 1 Graphic Scoop Shirt features a fully recycled polyester construction that manages moisture and some artsy graphics to keep you looking fresh.

Marmot Lightweight Zip-Neck Shirt - Long Sleeve - Women's

Marmot made the new Women's Lightweight Zip Neck Long Sleeve Shirt with quick-drying Polartec Power Dry material and funk-fighting Cocona performance treatment so you can hit the trail harder without smelling like your socks.

Mountain Hardwear Microchill Zip-Top - Women's

The Mountain Hardwear Women's Micro Chill Zip Tee lets you continue your morning trail runs right up until the first snow.

Patagonia Merino 4 Classic Zip Neck Shirt - Long-Sleeve - Women's

On the skin track up and the epic turns down, the Patagonia Women’s Merino 4 Classic Zip Neck Shirt lets its moisture-wicking, odor-fighting, insulating capabilities really shine.

Kombi Bamboo 4-Way Stretch Crewneck Top - Women's

Kombi’s Bamboo 4-Way Stretch Crewneck Top for women weaves bamboo fibers into a high-tech base layer.

SmartWool Microweight Crew - Women's

Wear the SmartWool Women's Microweight Crew top for cool- or warm-weather aerobic activities or as a next-to-skin base layer.

Icebreaker Nature 200 Scoop Top - Long-Sleeve - Women's

Icebreaker made the Women's Nature Lite Scoop Top to be a base layer, but with a slim fit, flattering scoop neckline, and feminine pigment print, you may not want to hide it underneath a pullover or jacket.

The North Face Fusion Top - Women's

The North Face has strategically placed seamless, breathable mesh fabric in the Women’s Fusion Top to increase breathability in critical areas.

SmartWool Microweight Crew Top - Women's

You put most of your long-underwear tops away after the winter. The SmartWool Women's Microweight Crew Top, however, stays out through spring and reappears during the fall.

Icebreaker Nature 200 Haven V-Neck Top - Long-Sleeve - Women's

Wear the Icebreaker Women's Nature Lite Haven V-Neck Top by itself or as your baselayer.

The North Face Stretch Softwool Tee - Women's

If you’re sick of your synthetic baselayer top smelling unbearable after a day of alpine climbing or skiing, but you’re apprehensive about a full-wool top, look at The North Face Women’s Stretch Softwool Tee.

Ibex Woolies Crew Top - Women's

Throw out your synthetic long johns and make the switch to merino wool with the Ibex Women's Woolies Crew Top. This lightweight, long underwear top gives you super soft, temperature-regulating insulation.

Icebreaker BodyFit150 Atlas T-Shirt - Long Sleeve - Women's

Pull on the slim-fit Icebreaker Women's BodyFit150 Atlas Long-Sleeve T-Shirt to go for a hike or trail run, or for a day at the climbing crag. This crewneck merino wool shirt insulates so you stay warm on cool days.

Kombi Pro-Line180 1/4 ZipneckTwo Tone Top - Women's

The Kombi Pro-Line 180 ¼ Zipneck Two-Tone Top is so striking, you’ll hate to cover it up.

Arc'teryx Ether Crew Long-Sleeve - Women's

Whether you’re skiing, hiking, or climbing, you love the outdoors and that is why you wear the Arc’teryx Women’s Ether Long-Sleeve Crew.

Icebreaker BodyFit200 Oasis Print Crewe - Long-Sleeve - Women's

This limited-edition version of the Women's BodyFit200 Oasis Crewe features a design that Icebreaker modeled after the structure of Kiwi snowflakes.