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

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

We've updated the fit of our Women'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 one of our best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help prevent chafing as well as keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running, and more.

8-Inch 1/4 Zip For Vent Control
The center-front 1/4 zip runs 8" (20 cm) on a size medium — long enough to dump heat on climbs and skins, short enough to stay out of the way under a shell. YKK-style reverse-coil zipper pulls cleanly without catching on base layers.
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.
Updated Fit With Shoulder Panels
Re-engineered cut moves seams off the top of the shoulder and adds dedicated shoulder panels so a pack strap or bib doesn't rub against the seam line during long days on snow or trail.
Raglan Sleeves & Front-Wrap Seams
Raglan sleeve construction extends the shoulder line for unrestricted arm movement. The back body seam wraps to the front of the torso for added comfort and a cleaner fit under layers and packs.
Flatlock Seam Construction
Flatlock seams sit flat against skin to minimize chafing under layers, packs, and harnesses — important for long-output days where seam comfort determines whether you finish or turn 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
Category
Base Layer 1/4 Zip
End Use
Cold Weather, Layering
Technology
100% Merino Wool, Interlock Knit Construction
Gender
Women's
Available Sizes
XS, S, M, L, XL

Materials & Construction

Fabric Weight
Midweight 250g/m²
Fabric
100% Merino Wool. Exclusive of Decoration.
Center-Front Zipper
8" (20 cm) on size medium
Country of Origin
Made in Vietnam
Washing
Machine wash warm on a gentle cycle with like colors. Use a mild detergent — avoid fabric softeners and bleach, which coat the Merino fibers and reduce moisture-wicking and odor-resistance performance.
Drying
Tumble dry low. High heat can shrink Merino wool fibers and damage the interlock knit over time. For longest life, lay flat to dry when possible — air-dried Merino retains its shape and loft through more wear cycles.
Ironing & Decoration
Cool iron as needed. Do not iron decoration. Printed graphics, heat-transfer logos, and color-block panels can scorch or peel under direct high heat — use a press cloth if ironing is necessary.
Dry Cleaning
Do not dry clean. The harsh solvents used in commercial dry cleaning strip the natural lanolin from Merino wool, leaving fibers brittle and reducing the temperature-regulating properties that make the fabric perform.
Zipper Care
Close the 1/4 zip fully before washing to protect the slider and teeth. Periodically clear lint from the zipper track with a soft brush — built-up fiber can cause the slider to grab or skip teeth over time.
Storage
Store folded in a dry, breathable space. Merino's natural odor resistance means you can wear it multiple times between washes — a key performance feature that makes it ideal for multi-day trips and travel.

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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Merino Layer System — SW002828

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 8" zip vents 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 zip dumps heat on the climbs.
Daily Winter Wear
15° – 40°F
Under a flannel or sweater on the morning commute, the dog walk, the barn. 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 Women'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.


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