Classic All-Season Merino Base Layer Bottom
Classic All-Season Merino Base Layer Bottom
Classic All-Season Merino Base Layer Bottom
Smartwool

Classic All-Season Merino Base Layer Bottom

Logo with the text 'GUIDE PICK' and a bow graphic on a white backgroundGuide Pick™ Product

Smartwool's lightest Merino base layer, soft enough to wear all day and breathable enough to keep up on the approach, with natural temperature regulation and odor resistance built in.

Sale price$100.00 USD
Only 3 units left
Color: Black
Size: SM
Sizing: Smartwool Men's Apparel

Smartwool Men's Apparel Sizing

Size Chest Waist Hip Arm Length Inseam
S 36"-38"91.5-96.5cm 29"-31"73.5-78.5cm 36"-38"89-96.5cm 31"-32"68.5-81.5cm 30"-31"73.5-78.5cm
M 39"-41"99-104cm 32"-34"81.5-86.5cm 39"-41"99-104cm 32"-33"81.5-84cm 31"-32"78.5-81.5cm
L 42"-44"106.5-112cm 35"-37"89-94cm 42"-44"106.5-112cm 33"-34"84-86.5cm 32"-33"81.5-84cm
XL 45"-48"114.5-122cm 38"-40"96.5-101.5cm 45"-48"114.5-122cm 34"-35"86.5-89cm 33"-34"84-86.5cm
XXL 49"-51"124.5-129.5cm 41"-44"104-112cm 49"-51"124.5-129.5cm 35"-36"89-91.5cm 34"-35"86.5-89cm
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Pickup available at Whittaker Mountaineering

Usually ready in 24 hours

Classic All-Season Merino Base Layer Bottom

Classic All-Season Merino Base Layer Bottom

Black / SM

Whittaker Mountaineering

Pickup available, Usually ready in 24 hours

30027 SR 706 E
Ashford WA 98304
United States

+18002385756
Guide Pick Product

Diggin' in to Details

Our Take

The foundational layer for every forecast.

The Classic All-Season Merino Base Layer Bottom is the "set it and forget it" solution for variable mountain conditions. Designed to serve as your second skin from the high heat of a summer glacier approach to the biting cold of a winter belay, it balances the natural thermal regulation of Merino wool with added structural durability. Unlike pure wool layers that can wear thin after a season of hard use, this bottom features a reinforced core that stands up to the abrasion of layering systems while keeping soft wool against your skin, ensuring you stay dry, comfortable, and temperature-controlled regardless of what the mountain throws at you.

Guide Pick™
Straight From The Source

Why We Love It
Thomas Skoog

A base layer lives right against your skin all day, which means comfort is not a nice-to-have, it is the whole job. The Merino 150 delivers it without compromise. The fabric is Smartwool's lightest weight Merino, breathable enough for high output and warm enough to earn its place in a layering system across a range of conditions. Natural temperature regulation means it works in both directions, keeping you comfortable whether you are working hard on an approach or standing still at a belay. The antimicrobial properties of Merino wool also mean you can wear it on multi-day objectives without it becoming a problem for everyone around you. The nylon core construction adds durability without pulling Merino away from your skin, so you get the softness of wool with a little more longevity than a pure Merino piece.

“The Smartwool merino 150 is soft, breathable and most importantly comfortable!”
— Thomas Skoog, RMI Guide
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Product Comparison

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Best For

Year-round mountaineering, ski touring, alpine climbing, and backpacking.

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

—
Summits
  • Rainier (Standard Climb)
  • Rainier (Standard Climb)
—
Activities
  • Mountaineering
  • Backpacking
  • Ski Mountaineering
  • Mountaineering
  • Hiking
  • Backpacking
  • Ski Mountaineering
—

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