Name: Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip
Brand: Smartwool
SKU: SW002821K66100S000
Price: 130.0 USD
Availability: InStock

Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip

$130.00

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Men's Classic Thermal Merino Base Layer 1/4 Zip

Description Key Features Specifications Care

We've updated the fit of our Men's Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of our heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature-regulated as you enjoy high-intensity skiing, hiking, running, and more.

10-Inch 1/4 Zip For Vent Control

The center-front 1/4 zip runs 10" (25 cm) on a size medium — long enough to dump serious heat on climbs and skinning, short enough to stay clear of midlayers and shells. Reverse-coil construction pulls cleanly without catching base layers below.

100% Responsibly Sourced Merino Wool

Single-jersey 100% Merino wool interlock knit delivers natural moisture management, body-temperature regulation, and odor resistance. Responsibly sourced wool supports animal welfare and traceable land management.

Offset Shoulder & Side Seams

Shoulder panels eliminate top-of-shoulder seams so pack straps and bib straps don't dig into the seam line. Side seams wrap to the front of the body for added comfort under layers and a cleaner fit through the torso.

Flatlock Seam Construction

Flatlock seams sit flat against skin to minimize chafing under layers, packs, and harnesses. Built for long days on snow, ice, and trail where seam comfort makes the difference between finishing and turning around.

Slim Base-Layer Fit

Slim fit intended to follow the contours of the body without bunching. Layers cleanly under an insulated jacket or shell and stays tucked when you reach overhead.

Multi-Activity Versatility

Built for high-intensity skiing, hiking, climbing, running, and cold-weather biking. The vent-friendly 1/4 zip lets you dump heat on the up without removing layers.

Technology

100% Merino Wool, Interlock Knit Construction

General

Fit

Slim fit

Shipping Policy

Components:

All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 4-7 business days of purchase.

Bicycles:

Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.

Riding Gear & Apparel:

Riding gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 3-10 business days.

Returns & Exchanges:

If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.

For full details, please see our Refund Policy before initiating a return.

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{"id":53104523903296,"title":"Winter Moss Heather \/ S","option1":"Winter Moss Heather","option2":"S","option3":null,"sku":"SW002821K66100S000","requires_shipping":true,"taxable":true,"featured_image":{"id":57346413592896,"product_id":10254882439488,"position":1,"created_at":"2026-09-07T12:31:48-07:00","updated_at":"2026-09-07T12:31:49-07:00","alt":null,"width":1600,"height":1600,"src":"\/\/spokex.com\/cdn\/shop\/files\/SW002821K661.jpg?v=1788809509","variant_ids":[53104523903296,53104523936064,53104523968832,53104524001600,53104524034368]},"available":true,"name":"Smartwool Men's Classic Thermal Merino Base Layer 1\/4 Zip - Winter Moss Heather \/ S","public_title":"Winter Moss Heather \/ S","options":["Winter Moss Heather","S"],"price":13000,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"198268449003","featured_media":{"alt":null,"id":44359843938624,"position":1,"preview_image":{"aspect_ratio":1.0,"height":1600,"width":1600,"src":"\/\/spokex.com\/cdn\/shop\/files\/SW002821K661.jpg?v=1788809509"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}

Merino Layer System — SW002821

Built For

High-Output Days

20° – 45°F

Skinning up ridges, trail running, and cold-weather biking where output swings between hard and steady. The 10" zip dumps serious heat without breaking the layer.

Cold-Weather Hiking

20° – 45°F

Shoulder-season trails where you crest a saddle and the wind picks up. Midweight 250 stays warm on the down while the offset shoulder seams keep pack straps from digging in.

Daily Winter Wear

15° – 40°F

Under a flannel or sweater on the morning commute, the woodpile, the shop. The 1/4 zip doubles as a refined stand-alone layer indoors.

Sleep & Camp

Sub-Freezing

Midweight 250 sleeps warm without overheating in a bag. The vent-friendly zip keeps the comfort zone wider across overnight temperature swings.

Complete The System

Pair It With The Bottom

The Men's Classic Thermal Merino Base Layer Bottom matches weight, fit, and fabric so your upper and lower layers regulate as one system — no hot torso, cold legs.

Same 250g/m² midweight matched warmth
100% Merino wool identical fabric feel
Slim base-layer fit won't bunch under bibs
Flatlock seams no chafe under packs

Add A Shell

Top It With A Windshell

For full output in real weather, layer a lightweight windshell or rain jacket over the 1/4 zip. Merino manages moisture from the inside; the shell blocks wind and precip from the outside.

Windshell cuts chill on exposed ridges
Rain jacket full weather protection
Insulated vest core warmth, free arms
Midlayer fleece deep-cold static days

Prepared with intention.

Every product is carefully inspected and handled by our team before it ships. From fit and function to final details, we make sure each piece is ready for the outdoors ahead—so you can focus on the experience, not the gear.

Passion drives us

At SpokeX Bike Co., bikes aren't just our business — they’re our way of life. As a rider-owned and operated shop, every decision we make comes from firsthand experience on the trail, at the race, and on the open road. We know what it’s like to chase a new line, push through the pain cave, and celebrate the ride — because we live it every day.

Men's Classic Thermal Merino Base Layer 1/4 Zip

Shipping Policy

Built For

Pair It With The Bottom

Top It With A Windshell

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