How to Choose Base Layers
REI Co-op Midweight Base Layer Half-Zip Top - Men's
This product is not available. Good news: we have a newer version.
Hard-charging winter days start out cold, but you always warm up. The men's REI Co-op Midweight Base Layer half-zip top offers the warmth of long sleeves and the easy venting of a front zipper.
Shop newer version- Smooth outer face lets layers slide on easily, while a brushed interior provides warmth
- High neck coverage with a half-zip front lets you open up for venting when you're working hard
- Fabric wicks moisture and dries quickly to keep you comfortable
- 4-way stretch delivers a flexible range of motion
- Flatseam construction reduces bulk and chafing, and rolled-forward shoulder seams prevent abrasion from pack straps
- UPF 50+ rating protects against sun rays
- Contains materials that meet the bluesign® criteria
- Made in a Fair Trade Certified™ factory
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
Imported.
View all REI Co-op Men's Base Layer Tops| Best Use | Multisport |
|---|---|
| Shirt Type | Partial-zip |
| Fabric | Polyester (bluesign® approved) |
| Sun-Protective Fabric | Yes |
| UPF Rating | 50 |
| Moisture Wicking | Yes |
| Quick Drying | Yes |
| Underwear Weight | Midweight |
| Sleeve Length | Long Sleeve |
| Gender | Men's |
| Sustainability | Contains materials that meet the bluesign® criteria Fair Trade Certified™ Factory From a Climate Label Certified brand |
REI Co-op Clothing - Men's
| XS | S | M | L | XL | XXL | XXXL | 24 IN Waist | 26 IN Waist | 28 IN Waist | 30 IN Waist | 31 IN Waist | 32 IN Waist | 33 IN Waist | 34 IN Waist | 35 IN Waist | 36 IN Waist | 38 IN Waist | 40 IN Waist | 42 IN Waist | 44 IN Waist | 46 IN Waist | 48 IN Waist | 50 IN Waist | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chest | 35 | 36 - 38 | 39 - 41 | 42 - 45 | 46 - 49 | 50 - 53 | 54 - 57 | |||||||||||||||||
| Sleeve Length | 32 | 32.5 | 33 | 33.5 | 34 | 34.75 | 35.5 | |||||||||||||||||
| Waist | 27.5 | 28 - 30 | 32 - 34 | 36 - 38 | 40 - 42 | 44 - 46 | 48 - 50 | 24 | 26 | 28 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 |
| Hip | 33.5 | 34.5 - 36.5 | 37.5 - 39.5 | 41 - 43 | 44 - 46.5 | 47.5 - 50.5 | 51.5 - 54.5 | 32 | 33.5 | 34.5 | 36.5 | 37 | 37.5 | 38.5 | 39.5 | 40.25 | 41 | 43 | 44 | 46.5 | 47.5 | 50.5 | 52.5 | 54.5 |
| Inseam | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
Sizing Notes
Measurements are stated in inches unless otherwise indicated. Size chart values represent body measurements, not garment measurements.
SHORT: Some pants are available in short sizes, which generally means an inseam that is 2.5 inches shorter than regular sizes.
TALL: Some pants, shirts, jackets and parkas are available in tall sizes, which generally means an inseam that is 3 inches longer and a rise that is 1 inch longer, a shirt or jacket body that is 2 inches longer, a parka body that is 2.5 inches longer and sleeves that are 2.5 inches longer than regular sizes.
Capri or cropped pants have an intentionally shorter inseam—reference the technical specs instead of this chart.
Inseam is measured to the floor.
Buying Advice
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Most Helpful Favorable Review
Nice piece of gear
Snake6 years ago
Impulse buy on a Black Friday deal. Pretty happy I did. Fit is nice, garment is very comfortable with no tags or scratchy seams. I wear it cycling mainly, today was in the high teens and with a good lined jacket it was fine. If it gets a little colder maybe a thin t-shirt base layer under. I wear it in the 30's with a lighter jacket. My jackets are Gore cycling which fit somewhat tight so the not-bulky fit of this base is perfect.
A note on fit. I generally wear a large but some REI branded gear (Two jackets and this) I can get away with a medium if I want a more fitted feel.
Overall glad I got this instead of a thinner base as it's more versatile.
Snake
Northeast
9 people found this review helpful
Most Helpful Critical Review
Fine until you wash it
Todd6 years ago
Loved the top! Felt great and looked great. Problem came from washing. I hand wash all my thermals and have never had a problem with REI brand clothing. Until now. Both times (I exchanged the first one and returned the second and got something else) defects in the fabric kind of like when you pull a loose thread that just keeps on coming. Since this happend twice, even though wash instructions on the label said machine washable, I urge REI to pull this item off the rack so others dont have to deal with this. I've been an REI member since they first opened a store in Salt Lake City and will continue to go to REI first for all my outdoor gear. Even though I had issues with this shirt, returns were hassle free and the staff are the best.
Todd
Boston, MA
17 people found this review helpful
Customer Images
Snake
Northeast
Nice piece of gear
6 years ago
Impulse buy on a Black Friday deal. Pretty happy I did. Fit is nice, garment is very comfortable with no tags or scratchy seams. I wear it cycling mainly, today was in the high teens and with a good lined jacket it was fine. If it gets a little colder maybe a thin t-shirt base layer under. I wear it in the 30's with a lighter jacket. My jackets are Gore cycling which fit somewhat tight so the not-bulky fit of this base is perfect. A note on fit. I generally wear a large but some REI branded gear (Two jackets and this) I can get away with a medium if I want a more fitted feel. Overall glad I got this instead of a thinner base as it's more versatile.
Yes , I recommend this product
Lynndie
Ventura, CA
Purchased for a trip to New Zealand
6 years ago
A few days before we flew to New Zealand I purchased one more REI brand shirt to be sure I had enough. It was on sale, in my size and my wife liked it. The first few times I wore it everything was fine. However about our third week into the trip my wife noticed a snag right next to the zipper placket, revealing some white underneath. She will try to fix it but if not we might be returning it. It’s too bad because I don’t remember having brushed against anything which would snag the fabric. All of the other shirts I purchased at REI for the trip are wearing well.
No, I do not recommend this product
John
Maryland
Nice as a base layer or by itself
3 years ago
I was looking for something that could double for use by itself during "shoulder seasons" as well as a base layer when it gets colder. I took a flyer on this, and I'm glad I did. The fabric is very comfortable and it seems like it got a little softer after a few washes. The arms are a little longer than others I was looking at, which is a definite plus, and fit snugly at the wrist. The only reason I didn't give it 5 stars is because I don't know how it will hold up in the long run, but in regular use so far (a couple months) it's been a nice addition. Not to mention that at this price point it's a great value. Thumb's up!
Height:6'2"
Weight:150–175 lbs.
Yes , I recommend this product
Todd
Boston, MA
Fine until you wash it
6 years ago
Loved the top! Felt great and looked great. Problem came from washing. I hand wash all my thermals and have never had a problem with REI brand clothing. Until now. Both times (I exchanged the first one and returned the second and got something else) defects in the fabric kind of like when you pull a loose thread that just keeps on coming. Since this happend twice, even though wash instructions on the label said machine washable, I urge REI to pull this item off the rack so others dont have to deal with this. I've been an REI member since they first opened a store in Salt Lake City and will continue to go to REI first for all my outdoor gear. Even though I had issues with this shirt, returns were hassle free and the staff are the best.
No, I do not recommend this product
E roc
Woodinville,WA
Almost what I was expecting
3 years ago
I have the lightweight version of this item and have been very pleased with its versatility - in that it can be opened up depending upon conditions. The zipper on this version is 3 inches shorter than the one on my lightweight piece! Both are size L.
Age:55–64
Weight:175–200 lbs.
Height:5'11"
Windriver
Seattle WA
Threads pull out easy
7 years ago
I used this as a very nice over layer for a two week trip. Unfortunately, i found that the threads easily started to pull out with very casual contact with some velcro on a vest. I become more concerned when other threads started to pull out from a sleeve that had little or no contact. I don't think a layer like this should be so sensitive to any contact. I returned it for a refund and would be careful before buying it although, it is a perfect weight for an overlayer.
No, I do not recommend this product
TOCYCLE
Raleigh, NC
Hits a sweet spot
3 years ago
An excellent example of REI's ability to design and produce an excellent product at an excellent price. In my layering system I use this and the REI base layer bottoms when I need something a bit warmer than my usual lightweight base layer. Just came back from a ski trip to Vail and used this on the slopes under a lightweight fleece vest and midweight waterproof/breathable snow jacket. It's soft and almost fleecy against your skin. It does have a habit of absorbing odors during a long sweaty day but a trip through the washing machine remedies that easily. With a comfy close fit combined with an easy to take price, I'm gonna have to get another set!
Age:55–64
Weight:200–225 lbs.
Height:5'11"
Yes , I recommend this product
Führy
Charlotte, NC
Comfortable all-around quarter zip
7 years ago
The first thing I notice about this was that the cut seems a bit more tailored than previous REI branded tops I've bought which I like a lot. The weight seems just about perfect for me as it is thick enough to add some warmth but no too thick and breathable enough to keep you from getting too hot. Also, the inside is surprisingly soft and comfortable. I really hope this stands up to years of love, abuse, and cleaning. Wins on: fit, weight, comfort. Durability is TBD.
Yes , I recommend this product
Dread the thread
Philadelphia, PA, United States
Bad material
7 years ago
Shirt material easily pulls threads with as little as contact with a coat
No, I do not recommend this product
cliff_fjord
Denver, CO
Perfect fit, comfort & flexibility
7 years ago
Great mid-weight pullover. Perfect for 3-season wear in Colorado. Originally purchased in dark gray; loved it so much I bought another in navy. Large fits like a glove (6’0” 210lbs). One word of caution: the texture in these is slightly prone to snags, so long term durability may be an issue. But for a layering piece, this is tough to beat.
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