



Description
Smartwool updated the fit of the Men's Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of the 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.
- Classic 100% thermal merino
- Slim Fit intended to follow the contours of the body
- Moisture management
- Temperature regulation
- Odor resistance
- Merino wool with interlock knit for comfort
- Flatlock seam construction
- Offset shoulder and side seams minimize chafing
- Side seams wrap to front
- Size medium center-front zipper: 10" (25 cm)
- Made in Vietnam
- 100% Wool-Merino, exclusive of decoration
Product Reviews
Review Snapshot
by PowerReviews
Sleeve Length
Most Liked Positive Review
The Benchmark for Wool Clothing
When these quarter zips go on sale for the fall/winter seasons, I purchase two or three (every year). I love them that much. I wear them for a season or two and then give them to my son. He loves free Smartwool products (at Dad's expense of course). For size comparison, I am six feet, four inche...
Most Liked Negative Review
Dye transfer ruined leather seats
How does this 1/4 zip get such great reviews? Did I get a faulty top? Was the fabric not dyed correctly?It wouldn't be unusual to get dye transfer from a new pair of indigo jeans, but from a Smartwool top??? My husband bought this top in navy and it ruined the leather seats of his BRAND NEW CAR. ...
Reviewed by 653 customers
If I need anoter base layer I would consider buying again
Soft. Comfortable. Looks good
It's like wearing a heater……
I walk my dog 2.5 miles a day and never miss a day due to the cold PA winters. I despise wearing several layers of clothing to stay warm. You don't need to do that with this quarter zip top. It's like wiring a heater! I wear this and a mid weight winter coat and that's all I need. This is the second quarter zip base layer top I've purchased from Smart Wool and they are both amazing. Great product.
I have bought this item again and again
My husband is a paraplegic who does not have the ability to regulate his temperature. He wears this 1/4 zip in the house as well as when he participates in outdoor activities. He has stayed warm even when he goes out in the winter for adaptive sports like skiing. I was disappointed when the thumb hole was discontinued.

We have been buying these for the last 10+ years.
My husband loves these. They have become his favorite layer from fall to spring.
I will pay another color soon
As a medium weight Smartwool, the thermo base layer is perfect over a tee shirt and under a parka on cold days Form fitting makes it great for golf with a wind shirt over it for temps down to freezing And neutral color goes with just about anything
Love this.
Great product. Heavy fabric. Perfect for winter as an undergarment. Perfect for spring as an outer shirt. Very high quality. Love it.
The best garment in my kit
This adds versatility in maintaining body temperature. The zipper is sewn so you don't feel it when it's up, not scratchy like lower quality products. It is a functional, practical piece of gear which functions to give the user more time to decide whether to stop and shed a layer. The wool is comfy. It wicks moisture. In cold weather wear it over a crew neck base layer for a great look and excellent performance.
I would buy again - no doubt.
Can't say enough about Smartwool products. I tend to use them for days without having access to a washer and they never smell- and a wash later and good to go. Dries fast and feels great even when sweating in the cold. The best product period (in my mind).

Official Response by Smartwool, a division of VF Outdoor, LLC
We love hearing from brand fans like you! Thanks for the kind review.