Women's Classic All-Season Merino Base Layer Bottom

Smartwool

Women's Classic All-Season Merino Base Layer Bottom

Guide Pick™ Product

A merino base layer that solves the durability problem, with reinforced fabric that survives harness and shell contact, weight-appropriate insulation for freeze-thaw conditions, and a wool-lined waistband that stays comfortable under a heavy pack.

$100.00 USD

Only 2 units left

Color: Black

Black Nightfall Blue

Size: XS

Sizing: Smartwool Women's Apparel

Smartwool Women's Apparel

Size	X-Small 0-2	Small 4-6	Medium 8-10	Large 12-14	X-Large 16-18
Chest	32" - 33" \| 81.5 - 84cm	34" - 35" \| 86.5 - 89cm	36" - 38" \| 91.5 - 96.5cm	39" - 40" \| 99 - 101.5cm	41" - 44" \| 104 - 112cm
Waist	24" - 25" \| 61 - 63.5cm	26" - 27" \| 66 - 68.5cm	28" - 30" \| 71 - 76cm	31" - 34" \| 78.5 - 86cm	35" - 38" \| 89 - 96.5cm
High Hip	31" - 32" \| 78.5 - 81.5cm	33" - 34" \| 84 - 86.5cm	35" - 36" \| 89 - 91.5cm	37" - 39" \| 94 - 99cm	40" - 43" \| 101.5 - 109cm
Hip	35" - 36" \| 89 - 91.5cm	37" - 38" \| 94 - 96.5cm	39" - 40" \| 99 - 101.5cm	41" - 43" \| 104 - 109cm	44" - " \| 112 - 119.5cm
Inseam	29" - 30" \| 73.5 - 76cm	30" - 31" \| 76 - 78.5cm	31" - 32" \| 78.5 - 81.5cm	32" - 33" \| 81.5 - 84cm	33" - 34" \| 84 - 86.5cm
Arm Length	27" - 28" \| 68.5 - 71cm	28" - 29" \| 71 - 73.5cm	29" - 30" \| 73.5 - 76cm	30" - 31" \| 76 - 78.5cm	31" - 32" \| 78.5 - 81.5cm

Quantity:

The one layer that never leaves your kit.

The Women's Classic All-Season Merino Base Layer Bottom is the first thing you put on for a climb and the last thing you take off. Built with Smartwool’s Core Spun technology, it wraps Merino wool around a nylon core, giving you the durability to withstand seasons of use without losing the soft, temperature-regulating feel of wool against your skin. The mid-rise waist and flatlock seams are designed to sit flat under harness leg loops and shell pants, eliminating chafing during long days on the move.

Free Shipping + Easy Returns

Free Shipping on order over $150, and no hassle returns - we're all about simplicity.

Pickup available at Whittaker Mountaineering

Usually ready in 24 hours

Women's Classic All-Season Merino Base Layer Bottom

Black / XS

Whittaker Mountaineering

Pickup available, Usually ready in 24 hours

30027 SR 706 E
Ashford WA 98304
United States

+18002385756

Smartwool Women's Classic All-Season Merino Base Layer Bottom

$100.00 USD

Guide Pick Product

Diggin' in to Details

Our Take

These are the base layers we tell people to buy when they ask, "If I only get one pair, which should it be?" They hit that sweet spot of being light enough that you won't overheat on the approach but warm enough to act as a solid foundation when the temperature drops. We especially appreciate the Merino-lined waistband, it’s a small detail that prevents the dreaded digging feeling when you're wearing a heavy pack or climbing harness all day.

Details & Features

Core Spun Durability: Merino fibers are wrapped around a recycled nylon core to increase tensile strength, resisting holes and tears while keeping 100% soft wool next to your skin.
Merino-Lined Waistband: Designed for long days in motion, the elastic waistband is fully lined with Merino wool to prevent chafing and irritation under a pack or harness.
Smooth Seam Construction: Merrow stretch stitching and flatlock seams minimize bulk and eliminate pressure points, ensuring full range of motion without friction.
Body-Mapped Fit: The updated slim fit follows the body’s contours for efficient moisture management and easy layering under ski pants or hiking trousers.
Year-Round Versatility: The 150g weight acts as a standalone legging in warmer temps or a low-bulk base layer in freezing conditions.

Specs

Specs & Materials

Fit: Slim
Fabric Weight: 150 g/m²
Materials: 88% Merino Wool, 12% Recycled Nylon
Inseam (Medium): 31 in (79 cm)
Origin: Made in Vietnam

Sizing

Smartwool Women's Apparel

Size	X-Small 0-2	Small 4-6	Medium 8-10	Large 12-14	X-Large 16-18
Chest	32" - 33" \| 81.5 - 84cm	34" - 35" \| 86.5 - 89cm	36" - 38" \| 91.5 - 96.5cm	39" - 40" \| 99 - 101.5cm	41" - 44" \| 104 - 112cm
Waist	24" - 25" \| 61 - 63.5cm	26" - 27" \| 66 - 68.5cm	28" - 30" \| 71 - 76cm	31" - 34" \| 78.5 - 86cm	35" - 38" \| 89 - 96.5cm
High Hip	31" - 32" \| 78.5 - 81.5cm	33" - 34" \| 84 - 86.5cm	35" - 36" \| 89 - 91.5cm	37" - 39" \| 94 - 99cm	40" - 43" \| 101.5 - 109cm
Hip	35" - 36" \| 89 - 91.5cm	37" - 38" \| 94 - 96.5cm	39" - 40" \| 99 - 101.5cm	41" - 43" \| 104 - 109cm	44" - " \| 112 - 119.5cm
Inseam	29" - 30" \| 73.5 - 76cm	30" - 31" \| 76 - 78.5cm	31" - 32" \| 78.5 - 81.5cm	32" - 33" \| 81.5 - 84cm	33" - 34" \| 84 - 86.5cm
Arm Length	27" - 28" \| 68.5 - 71cm	28" - 29" \| 71 - 73.5cm	29" - 30" \| 73.5 - 76cm	30" - 31" \| 76 - 78.5cm	31" - 32" \| 78.5 - 81.5cm

Guide Pick™

Straight From The Source

Why We Love It
Stella Johnson

Our guides pick these because they solve the classic wool durability problem; the reinforced fabric actually survives seasons of rubbing against shell pants and harness leg loops. The weight is ideal for the "freeze-thaw" nature of mountaineering, regulating your temperature so you aren't constantly stopping to change layers. Plus, the wool-lined waistband is a game-changer for comfort, eliminating the digging and chafing typical under a heavy expedition pack.

“Having a wool baselayer for pants is incredible when it is really cold. The smartwool baselayer provides warmth, even when saturated with sweat.”
— Stella Johnson, RMI Guide

See The Full Survey → How Voting Works

Our Philosophy

We Simplify Outfitting

Whittaker Mountaineering was born out of the need for RMI to make sure their clients had the appropriate gear to get to the top of Mt. Rainier safely. After decades of trying, reviewing, arguing-over, and recommending gear, we can’t help but know what we’re doing by this point. We know what works, we know what doesn’t, and we use that expertise to stock our store.

Who are these guys?

Smartwool

Smartwool revolutionized the outdoor industry by introducing the performance benefits of Merino wool to the world of active pursuits. We carry them at Whittaker Mountaineering because they consistently set the standard for active comfort and temperature regulation. Their gear is built to handle the rigors of the mountains while remaining soft enough for days of continuous wear, making them a reliable staple in any climber's kit.

See More From Smartwool

Best For

Mountaineering, alpine climbing, ski touring, backpacking, and hiking in variable conditions.

Summits

Rainier (Standard Climb)

Activities

Mountaineering
Hiking
Backpacking
Ski Mountaineering

What's the diff?

Product Comparison

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Best For

Mountaineering, alpine climbing, ski touring, backpacking, and hiking in variable conditions.

Mountaineering, backcountry skiing, winter backpacking, and cold-weather daily wear.

—

Summits

Rainier (Standard Climb)

Rainier (Standard Climb)

—

Activities

Mountaineering
Hiking
Backpacking
Ski Mountaineering

Mountaineering
Hiking
Backpacking
Ski Mountaineering

—

Size	X-Small 0-2	Small 4-6	Medium 8-10	Large 12-14	X-Large 16-18
Chest	32" - 33" \| 81.5 - 84cm	34" - 35" \| 86.5 - 89cm	36" - 38" \| 91.5 - 96.5cm	39" - 40" \| 99 - 101.5cm	41" - 44" \| 104 - 112cm
Waist	24" - 25" \| 61 - 63.5cm	26" - 27" \| 66 - 68.5cm	28" - 30" \| 71 - 76cm	31" - 34" \| 78.5 - 86cm	35" - 38" \| 89 - 96.5cm
High Hip	31" - 32" \| 78.5 - 81.5cm	33" - 34" \| 84 - 86.5cm	35" - 36" \| 89 - 91.5cm	37" - 39" \| 94 - 99cm	40" - 43" \| 101.5 - 109cm
Hip	35" - 36" \| 89 - 91.5cm	37" - 38" \| 94 - 96.5cm	39" - 40" \| 99 - 101.5cm	41" - 43" \| 104 - 109cm	44" - " \| 112 - 119.5cm
Inseam	29" - 30" \| 73.5 - 76cm	30" - 31" \| 76 - 78.5cm	31" - 32" \| 78.5 - 81.5cm	32" - 33" \| 81.5 - 84cm	33" - 34" \| 84 - 86.5cm
Arm Length	27" - 28" \| 68.5 - 71cm	28" - 29" \| 71 - 73.5cm	29" - 30" \| 73.5 - 76cm	30" - 31" \| 76 - 78.5cm	31" - 32" \| 78.5 - 81.5cm

Size	X-Small 0-2	Small 4-6	Medium 8-10	Large 12-14	X-Large 16-18
Chest	32" - 33" \| 81.5 - 84cm	34" - 35" \| 86.5 - 89cm	36" - 38" \| 91.5 - 96.5cm	39" - 40" \| 99 - 101.5cm	41" - 44" \| 104 - 112cm
Waist	24" - 25" \| 61 - 63.5cm	26" - 27" \| 66 - 68.5cm	28" - 30" \| 71 - 76cm	31" - 34" \| 78.5 - 86cm	35" - 38" \| 89 - 96.5cm
High Hip	31" - 32" \| 78.5 - 81.5cm	33" - 34" \| 84 - 86.5cm	35" - 36" \| 89 - 91.5cm	37" - 39" \| 94 - 99cm	40" - 43" \| 101.5 - 109cm
Hip	35" - 36" \| 89 - 91.5cm	37" - 38" \| 94 - 96.5cm	39" - 40" \| 99 - 101.5cm	41" - 43" \| 104 - 109cm	44" - " \| 112 - 119.5cm
Inseam	29" - 30" \| 73.5 - 76cm	30" - 31" \| 76 - 78.5cm	31" - 32" \| 78.5 - 81.5cm	32" - 33" \| 81.5 - 84cm	33" - 34" \| 84 - 86.5cm
Arm Length	27" - 28" \| 68.5 - 71cm	28" - 29" \| 71 - 73.5cm	29" - 30" \| 73.5 - 76cm	30" - 31" \| 76 - 78.5cm	31" - 32" \| 78.5 - 81.5cm

Women's Classic All-Season Merino Base Layer Bottom

Smartwool Women's Apparel

The one layer that never leaves your kit.

Our Take

Details & Features

Specs & Materials

Smartwool Women's Apparel

Why We Love It
Stella Johnson

Smartwool

Product Comparison

Specs & Materials

Specs & Materials

Product Care

Customer Reviews

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Women's Classic All-Season Merino Base Layer Bottom

Smartwool Women's Apparel

The one layer that never leaves your kit.

Our Take

Details & Features

Specs & Materials

Smartwool Women's Apparel

Why We Love It Stella Johnson

Smartwool

Product Comparison

Specs & Materials

Specs & Materials

Product Care

Customer Reviews

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Why We Love It
Stella Johnson