Smartwool Classic Thermal Merino Quarter-Zip Base Layer Top - Men's

View the 18 reviews with an average rating of 4.6 out of 5 stars

$120.00

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Great for high-intensity winter activities like skiing, hiking, running and more, the men's Smartwool Classic Thermal Merino Quarter-Zip base layer top is designed to keep you comfortable and warm.

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Updated fit for improved functionality and enhanced aesthetics
Fabric combines the moisture management, temperature regulation and odor-resistance of merino wool with interlock knit for comfort
100% responsibly sourced merino wool
Flatlock seam construction and offset shoulder and side seams are designed to help increase comfort and minimize chafing
Side seams wrap to front
Size medium center-front zipper: 10 in. (25 cm)
Smartwool slim fit is intended to follow the contours of the body

Imported.

View the Smartwool Classic Thermal Merino Product Line View all Smartwool Men's Base Layer Tops

Best Use	Multisport
Shirt Type	Partial-zip
Fabric	100% merino wool (exclusive of decoration)
Moisture Wicking	Yes
Quick Drying	Yes
Underwear Weight	Midweight
Sleeve Length	Long Sleeve
Gender	Men's

Smartwool Clothing - Men's

	S	M	L	XL	XXL
Chest	36 - 38	39 - 41	42 - 44	45 - 48	49 - 51
Sleeve Length	31 - 32	32 - 33	33 - 34	34 - 35	35 - 36
Waist	29 - 31	32 - 34	34 - 37	38 - 40	41 - 44
Hip	36 - 38	39 - 41	42 - 44	45 - 48	49 - 51
Inseam	30 - 31	31 - 32	32 - 33	33 - 34	34 - 35

Sizing Notes

Measurements are stated in inches.

How to Choose Base Layers

What material is best?

Wool is moisture-wicking and odor-resistant, while synthetic fabrics are more durable and less expensive.

Match the temp to the trek

Lightweight layers are best for moderate to cool temperatures. Midweight layers are best for cold temperatures. Heavyweight layers are best for below-freezing temperatures.

Find your fit

To be able to wick sweat efficiently, your next-to-skin layer needs to actually be next to your skin. A comfortably snug fit everywhere is your goal.

More expert advice

What to Wear Hiking

Layering Basics

Close up of someone that has fallen in the snow and is laughing about it.

How to Choose Insulated Outerwear

Ratings Snapshot

Product Rating

4.6

View the reviews with an average rating of 4.6 out of 5 stars18 Reviews

7 out of 8 (88%) reviewers recommend this product

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Average Customer Ratings

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Dfnd449

Rated 5.0 out of 5 stars

8 months ago

Very soft, nice quality, and looks great. Often Merino Wool shirts and sweaters run a bit small, but not Smartwool. The sleeves are long and extend below my wrist, which is tough to find for me. The overall fit is on point, maybe even 1/2 size larger than expected. Other brands don’t fit me properly and are a fairly tight. The generous cut works!

Height:6'2"

Weight:225–250 lbs.

Overall Fit Rating

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AC303

Colorado

Rated 5.0 out of 5 stars

4 months ago

I own like six or seven of these and wear them all the time whether it's for work, hiking or other outdoor pursuits because they're very comfortable, warm and wash up well. You just have to hang them upside down with clips rather than putting on a regular hanger because then the shoulders get sort of nappy. My very first one of these like 15 years ago doesn't have that issue but once you figure it out, it's not the end of the world.

Height:5'7"

Age:45–54

Weight:125–150 lbs.

Yes , I recommend this product

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Hikertrash420

Tennessee

Rated 5.0 out of 5 stars

5 months ago

I used this top with 250 bottoms on the Bartram, Appalachian, Benton mackaye route I put together last year it only got down to the 30s but it was everything that I needed I’ve used the same base layers for much colder hikes and at work down to 10 degrees Fahrenheit it works best with a fleece and a down jacket if the windchill is brutally cold I add a rain jacket as a windbreaker it works magic when it’s freezing outside when you can feel the cold through all your layers I couldn’t recommend Smartwool enough they really are the best of the best when it comes to base layers and wool products. I swear the clothes are made of some kind of alien technology lol for it to be so light and thin material it’s very comfortable and warm. Happy trails everyone.

Height:5'10"

Age:18–24

Weight:225–250 lbs.

Yes , I recommend this product

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Maureen James

Rated 5.0 out of 5 stars

5 months ago

This fit perfectly and is a great base layer for cooler temperatures. The grey-blue color goes well with many other colors. The shirt does not wrinkle and the fabric laid very smoothly around the zipper. It looks sharp even worn as a stand-alone shirt.

Height:6'0"

Weight:150–175 lbs.

Yes , I recommend this product

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GTomita

Chicago

Rated 5.0 out of 5 stars

1 month ago

Just got back from a trip to Switzerland and this Smartwool top was perfect! Great layering piece, easy to regulate temperature with the quarter-zip, and the cut looks very sharp; good for both hiking and city adventures. Also, I must admit our plans for clothes washing did not quite turn out, but it did not smell at all after several wearings… I am now a Smartwool fan for life.

Height:6'0"

Weight:150–175 lbs.

Yes , I recommend this product

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SEL

Rated 1.0 out of 5 stars

1 month ago

I ordered the size I always wear in Smartwool base layer shirts. The cut on this one is very strange: somewhat fitted body, but very baggy sleeves (even the cuff hangs loose), and baggy neck. And the armholes bind and bunch up when I raised my arm to shoulder height. I do not recommend unless you have a very small abdomen and gigantic neck, biceps and wrists.

No, I do not recommend this product

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Anonymous

Rated 5.0 out of 5 stars

5 months ago

This is great to have this packed away for any of my trips where I'll need to be layering. The center zip is good for venting if needed and goes down to my sternum. Sizing is accurate. Lastly, I make sure to follow Smartwool instructions to prolong life.

Height:6'0"

Weight:150–175 lbs.

Yes , I recommend this product

Overall Fit Rating

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Mikey Z

Vienna VA

Rated 4.0 out of 5 stars

3 weeks ago

Great for travel . Looks great. Comfortable( sized up to XXL to fit over mid layers_ usually XL). A full zip may have been better for shedding when warm

Height:6'2"

Age:55–64

Weight:225–250 lbs.

Helpful?

Happy in NC

Rated 5.0 out of 5 stars

5 months ago

This shirt is a perfect weight and extremely comfortable. Throw on another layer if it gets really cold or wet and you’re set.

Age:65–74

Yes , I recommend this product

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Bevster

Rated 5.0 out of 5 stars

5 months ago

Perfect mix of warm, lightweight, comfortable and stylish!

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1 - 10 of 18 Reviews

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Smartwool Classic Thermal Merino Quarter-Zip Base Layer Top - Men's

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Sizing Notes