Introducing the Men’s Merino Wool Base Layer Bottoms

Cold mornings. Long days outside. Trips that blur the line between winter and summer adventures.

They all demand one thing: a base layer that works hard without getting in the way.

That’s exactly why we built our Men’s Merino Wool Base Layer Bottoms — a moisture-wicking, odor-resistant thermal base layer designed for four-season adventure. From deep winter missions to chilly summer nights in a sleeping bag, this is the layer you’ll reach for again and again.

Built for Layering. Designed for Movement.

These men’s merino wool base layer bottoms are made to disappear under whatever your adventure demands.

Layer them under ski pants, nordic ski tights, or down puffies when winter settles in. Come summer, they slide easily under hiking pants, a drysuit, or straight into your sleeping bag when temperatures drop overnight.

Silky smooth against the skin. Naturally breathable. Never restrictive.

Because your base layer should support the adventure — not distract from it.

Why We Trust Merino Wool

Merino wool is the foundation of our cold-weather systems for a reason.

It naturally regulates temperature, wicks moisture, and resists odor — making it one of the most versatile performance fabrics for men’s outdoor clothing.

When you’re logging miles on skis, pedaling winter trails, or settling into camp after a long day, merino keeps you warm when it’s cold, breathable when you’re working hard, and fresher far longer than regular synthetics..

Less packing. Less overthinking. More moving.

Adventure-Tested Performance

These men’s thermal base layer bottoms are built for days that start cold and don’t slow down:

• Skiing & nordic skiing

• Snowshoeing & winter biking

• Hiking & packrafting

• Cold nights camping

• Travel in variable climates

Pair them with our Men’s Merino Wool Long Sleeve to create a complete base layer system dialed for year-round performance.

Fabric Options. Same Alpine Fit Performance.

We designed two fabric options to meet different durability preferences while keeping the same next-to-skin comfort.

Fall Fireweed
100% Merino Wool for classic softness and natural performance.

Slate
87% Responsible Wool Standard Merino Wool / 13% Recycled Nylon for added durability without sacrificing comfort.

Both are breathable, insulating, and built to move with you through seasons of use.

Fit That Layers Without Feeling Like Leggings

These bottoms feature a semi-fitted shape — slim enough to layer under snow pants, hiking pants, or even jeans, but relaxed enough to move comfortably without feeling like compression tights.

The waist uses a soft, plush-back stretch elastic that works seamlessly across both Granite and Cinder Fit waists, making them comfortable for all-day wear whether you’re skinning uphill or resting at camp.

If you want to dial in your fit, explore Your Alpine Fit for guidance.

The Details That Matter

• Weight: 7 oz (size L)

• Made in the USA of imported fabric

• Naturally moisture-wicking & odor-resistant

• Designed for next-to-skin comfort

• Built for long-term durability

The Bottom Line

When the temperature shifts and your plans stretch from sunrise to well after sunset, this is the layer that keeps up.

Pull them on once — and stop thinking about them.

That’s the goal.