SmartWool Men's Midweight Zip T

Priced: $74.99 - $109.99 Rated:   - 5 stars out of 5 by 22 reviews.
SmartWool Midweight Zip T
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Color: Taupe Heather
Available Colors: $74.99 - $105.00
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Rock/Creek Outfitters $104.95
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Mountain Gear $104.95
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Gearx $104.95
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Appalachain Outdoors $104.95
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REI $105.00
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Eastern Mountain Sports (EMS) $105.00
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Regularly: $107.47 $109.99
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SmartWool Midweight Zip T -

Made from Smartwool's warmest baselayer fabric, the Men's Midweight Zip T can withstand your most brutally cold winter adventure. The Midweight Zip T has flatlock seam construction and shoulder panels to eliminate top shoulder seams so wearing your pack on a long trek is more comfortable. A form fitting cut gives the Midweight Zip T awesome layering power while the UPF 50+ protection means you can safely wear it alone on sunny days. 10" (25cm) center front zip with semi-locking logo slider and heat transfer logo at left sleeve cuff. The Midweight Zip T is the performance single layer base you need for the coldest conditions.

Fabric: 100% Merino Wool


  • 8 in. front zipper ventilates on demand; raised collar keeps your neck warm in the cold

Wash and Care:

  • The men's SmartWool Midweight Zip-T top does not itch and will not shrink; machine wash and dry

Weather and Wind:

  • Shoulder panels eliminate top shoulder seams for nonchafing comfort when wearing a pack
  • Shoulder panels eliminate top shoulder seams, reduce chafing and optimize comfort under pack straps


  • SmartWool breathes, manages moisture vapor, and regulates temperature to keep you dry, comfortable, and warm
  • Shoulder panels offer more comfort with backpacks


  • Zip T with set-in sleeves has 10" (25cm) #3 coil zipper with chin guard
  • 10” (25cm) center front zip with semi-locking logo slider

Lining and Layers:

  • Next-to-Skin (NTS) midweight 250 base layer—works alone or as a cold-weather base layer


  • Form Fit
  • Rear body seams wrap around to front to enhance fit, and sculpted side panels also enhance fit


  • Made from pure merino wool for softness and warmth
  • With a UPF 50+ rating, fabric provides excellent protection against harmful ultraviolet rays
  • The SmartWool Midweight Zip-T top is made of merino wool to help maintain comfort whether the climate is warm, cold or in-between
  • Stripe tape binding at back neck and contrast color internal stitching detail
  • Fine merino wool fibers do not itch
  • Flatlock stitching eliminates abrasion, increases comfort and enhances fit by reducing bulky seams


  • Heat transfer logo at left sleeve cuff


  • All-over pattern
  • Jersey knit; UPF 30
  • Interlock knit; 50+ UPF for sun protection
  • Naturally resists odor
  • UPF 50
  • Knit in Vietnam
When the mercury dips, it's easy to get buried under the bulk of old-school cold-weather gear. Free yourself from the burden and shed those layers for the naturally breathable, moisture-wicking, and warm performance of a Smartwool® Midweight Zip T.
follows the body's natural contours.
Midweight fabric offers standalone or baselayer wear for cold-weather activity while maintaining optimum breathability.
naturally repels odor, wicks away moisture, and dries quickly.
Paneled shoulders for chafe-free wear under pack straps.
Flatlock stitching eliminates unwelcome friction.
+ sun protection.
Interlock-knit tee.
Stand collar.
Half-zip closure.
Long sleeves.
Extended hemline.
Little Man logo print at cuff.
100% New Zealand Merino wool.
Machine wash cold and tumble dry low.
Mountain Gear
The Midweight Zip T from Smartwool offers next to skin comfort and zip-neck ventilation making this a great option as a baselayer for cool weather actives.

Eastern Mountain Sports (EMS)
The Midweight Zip T is made from SmartWool's heaviest NTS fabric. Warm, yet still breathable for stop-and-go activities, it's ideal for cold weather.

Fiber Content: 100% merino wool.
Country of Origin: Imported


The men's SmartWool Midweight Zip-T top offers natural stretch, insulation and breathability during stop-and-go activities in fluctuating temperatures.

With the Mid 250 Zip T, you quit only when you want to. With next-to-skin Merino, it wicks and regulates core temp as a solo piece or smartly layers up when it gets icy. First Layer fit with no-chafe.

of 100% Merino Wool.
• 10 in. (25cm) center front zipper.

Appalachain Outdoors
That zipper on the front of this midweight baselayer gives you the benefit of increased control over your temperature. With moisture moving fibers that also keep you protected from the sun, this may be the perfect top.
Rock/Creek Outfitters
Our best selling, and warmest, baselayer, just got a little more refined with an improved fit, chaf-free seam construction and panels that offer more comfort with a pack.
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Review RatingNumber of Reviews
Also available for: Women
Clothing Fit:Regular Fit
Fabric:Wool / wool blend
Fabric Weight:250 g / m²
Fabrics/Materials:100% merino wool, 195 g/m2
Fit:Form fit
Form fit:follows the contours of the body
Length:31 in
Long Underwear Weight:Midweight
Material:100% Merino Wool
Moisture wicking:Yes
Quick drying:No
Shirt style:Zip-front
Sleeve length:Long Sleeve
Style:1/4 Zip
Sun Protection:UPF 35
Sun-protective fabric:Yes
Type:Long Sleeve
Underwear weight:Midweight
Weight:10.05 oz, 285 g
Compare specifications to related products.

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SmartWool Midweight Zip T Long SleeveSmartWool Midweight Zip T Long Sleeve$73.47 - $104.95

Subcategories of Fleece & Base Layers:

SmartWool Midweight Zip T Reviews:


Way less odor than synthetic shirts

I own base layers from REI, North Face, Nike, Brooks, etc plus numerous technical jerseys from races I have competed in over the years from a host of manufactures. They all share the common trait that after the slightest amount of perspiration, wait 2 hours and you smell like a locker room. The natural wool product is head and shoulders above the synthetic material in this regard. During cold weather backpacking trips it would get moist but it would take it 3 days to get as bad as a synthetic does after 3 hours.

I like that the shoulders are a separate piece of material so there is no seam at the top of the shoulder. This prevents a raw spot from the shoulder straps of a backpack.

The material is soft to the skin, no itching, chaffing, etc. Fit is true to size and warmth is as good or better than a synthetic in my opinion. I have recently decided this will be going with me to Rainier this fall instead of the synthetic one I had originally planned to take. 5 days in it without taking it off will certainly push the limits of its ability to fight odor, dry quickly and keep me warm.
RizingFenix at REI on 01/01/2013

Smart Wool Rocks

I love my Smart wool top. I have been doing training and races for close to 25 years and I have tried all kinds of warm weather gear. This is truly the best. I wore it for a 14 mile trail run the other day in 27 degree weather and it kept me so toasty. It wicked the sweat away from my skin and I never got chilled. I did have a thin shortsleeve layer under it but I was amazed how well it preformed. It is ver pricey at 100+ dollars but you get what you pay for. Make sure to store it in a container that prevents moths during the off months. My favorite Smart Wool hat was eaten last year stored in my dresser.
Tom "Dura"Sell at Rock/Creek Outfitters on 01/01/2013

My first baselayer

This was my first base layer I had ever purchased. I've just spent too many nights shivering around a campfire wishing I had brought a few more layers. This really does the trick! It is incredibly warm yet breathable, meaning no excessive sweating. I usually wear a medium and my SmartWool is true to size. It really holds in heat, so it's best used on cold days. I got too warm in mine on a day hike in about 60 degrees, but I've enjoyed it so much I bought a Microweight Zip-T for those warm days that I'll be exerting myself. I plan on swapping them at night so I have a nice, warm, and dry Midweight for nights by the fire.
Gregoriah Jameson at REI on 12/12/2012

great top

I really like this top, was a little scratchy the first time I put it on, but that didn't last long and it softened up nicely. It feels like very durable fabric, as all smartwool clothing does. I've warn it primarily for cold weather walks/runs with the dogs and working out on cold mornings so far, but think this is going to be a great base layer for cold weather backcountry trips this winter. The price tag is hard to swallow, but I think this top will last a good long time to make up for it.
christheboy at REI on 11/11/2013

My new favorite shirt

When I'm not backpacking, I'm traveling. This shirt is great, because it breathes and helps to regulate body temperature in changing conditions. I'm 5'10" and 150 lbs. The large fits in the shoulders and chest, but is baggy and long in the waist and the sleeves are a tad long. But I use this as a shirt over a thinner SmartWool T-shirt, and it's a perfect combo for hiking, hanging around the house, or flying across country.
DesertPacker at REI on 01/01/2013

Great Value

My husband owns this garment and my son borrowed it. My son asked for one as a gift. Both wear their's frequently both on the slopes and around town in the winter. Breathes better and not hot like poly. They like the same olive color. Does not retain odor and washes well on the "hand wash" setting in the machine. I flat dry it. Nothing negative about it.
tlane at REI on 01/01/2013

Perfect comfort and warmth

Spending this winter working outside in upper BC and Alberta. Smart wool from head to toe has been the key in staying warm while being less bulky. A whole set fits easy rolled up in a pack. You can hand wash a set after days of use and move into the 2nd set while drying. A must for any long period of cold weather exposure.
Ralz at REI on 12/12/2013

Excellent Baselayer Top Piece

This is a great piece. The front zipper allows one to control temperature. The high collar neckline keeps drafts out. I've worn this at 14,000 ft in January with -15 windchill and also during winter skills excercizes. This piece breathes well during periods of high excertion,
is warm on the mountain, and yet confortable on the drive home.

Love it!
rernst at REI on 01/01/2014

worth every penny

This sweater is great as a base layer, it is very breathable and dosn't retain ordor like cheaper cotton fabric. I work outside in the cold a lot and this has become my go-to base layer for staying warm. When the temperature rises or I move inside, it's easy to take off and packs very small.
dcsimon at REI on 01/01/2014

Fantastic base layer!

After years of using synthetic moisture wicking materials as a base layer, I decided to open the wallet and purchase a warm natural fiber wicking layer and Smartwool was the smart choice. Well worth the investment. Came home from my latest snowboard trip to Utah and purchased two more pairs of tops and bottoms.
Masterpeng at REI on 02/02/2013