How to Choose Base Layers
REI Co-op Lightweight Base Layer Half-Zip Top - Women's
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The women's REI Co-op lightweight half-zip base layer top wicks and breathes to keep you comfortable hiking or skiing as you go from cold to warm to overheated and back.
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- Made of a soft polyester blend that wicks sweat and dries fast to keep you warm in winter and cool in summer
- Spandex in the blend gives the fabric 4-way stretch, while underarm gussets ensure you can reach and move with ease
- High neck coverage with a half-zip front lets you open up for venting when you're working hard
- Flatseam construction is comfortable against your skin
- Lower back hem stays tucked when you stretch
- UPF 50+ sun protection
- Fitted
- 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
- Made in a Fair Trade Certified™ factory
Imported.
View all REI Co-op Women's Base Layer Tops| Best Use | Multisport |
|---|---|
| Shirt Type | Partial-zip |
| Fabric | 92% polyester/8% spandex |
| Sun-Protective Fabric | Yes |
| UPF Rating | 50 |
| Moisture Wicking | Yes |
| Quick Drying | Yes |
| Underwear Weight | Lightweight |
| Sleeve Length | Long Sleeve |
| Gender | Women's |
| Sustainability | Fair Trade Certified™ Factory From a Climate Label Certified brand |
REI Co-op Clothing - Women's
| XXS | XS | S | M | L | XL | 1X | 2X | 3X | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18W | 20W | 22W | 24W | 26W | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Numerical Size | 00 | 0-2 | 4-6 | 8-10 | 12-14 | 16 | 18 | 20-22 | 24-26 | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 |
| Bust | 31 | 32-33 | 34-35 | 36-37 | 38.5-40 | 41-42.5 | 43-45 | 47-49 | 51-53 | 32 | 33 | 34 | 35 | 36 | 37 | 38.5 | 40 | 42.5 | 45 | 47 | 49 | 51 | 53 |
| Sleeve Length | 29.5 | 30 | 30.5 | 31 | 31.5 | 32 | 32.5 | 33.5 | 34.5 | 30 | 30 | 30.5 | 30.5 | 31 | 31 | 31.5 | 31.5 | 32 | 32.5 | 33.5 | 33.5 | 34.5 | 34.5 |
| Waist | 24.5 | 25.5-26.5 | 27.5-28.5 | 29.5-30.5 | 32-33.5 | 34.5-36.5 | 37.5-39.5 | 40.5-42.5 | 44.5-46.5 | 25.5 | 26.5 | 27.5 | 28.5 | 29.5 | 30.5 | 32 | 33.5 | 36 | 38.5 | 40.5 | 42.5 | 44.5 | 46.5 |
| Hip | 34 | 35-36 | 37-38 | 39-40 | 41.5-43 | 44-46 | 47-49 | 50-52 | 54-56 | 35 | 36 | 37 | 38 | 39 | 40 | 41.5 | 43 | 45.5 | 48 | 50 | 52 | 54 | 56 |
| Inseam | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 |
Sizing Notes
Measurements are stated in inches unless otherwise indicated. Size chart values represent body measurements, not garment measurements. Some women's pants are available in petite and tall sizes. Typically petite sizes fit women 4'11" to 5'3". Regular sizes fit women 5'4" to 5'8". Tall sizes fit women 5'9" to 5'11".
PETITE: Generally, as compared to regular sizes, petite sizes are 2.5 inches shorter in inseam, 1 inch shorter in body length, 1.25 inches shorter in sleeve length and ¾ inch shorter in total rise.
TALL: tall sizes are 3 inches longer in inseam, 2 inches longer in body length, 2.5 inches longer in sleeve length and 1.25 inches longer in total rise.
Capri or cropped pants have an intentionally shorter inseam—reference the technical specs instead of this chart.
Inseam is measured to the floor.
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Most Helpful Favorable Review
Awesome temp control
pnwruth3 years ago
I'm someone who gets overheated really easily but also needs good sun protection; thus, the struggle for a longsleeve layer that's not too hot is eternal. This shirt is awesome and fits the bill. I love the material and use the zipper ventilation all the time. I also think it's quite flattering on my curvy body.
pnwruth
27 people found this review helpful
Most Helpful Critical Review
Good for tall people
Anon4 years ago
The fit was way too long for me. I'm 5'2 and 115 pounds so I ordered an XS. The only problem was the length. The material was thin but comfortable.
Anon
28 people found this review helpful
Customer Images
Botanical Amy
Denver, CO
Aggressively long
10 months ago
This is aggressively long. I am 5’4” and can almost wear it as a minidress.
Height:5'4"
Age:35–44
Weight:100–125 lbs.
No, I do not recommend this product
ADK wanderer
Nice lightweight layer, but...
2 years ago
This is a good lightweight base layer - well constructed and the celery color is nice. However, it was not exactly what I had expected. Hard to see in the model photo, but the fabric is "pointelle". Look at the bottom photo to see (unfortunately I didn't). As a result it really looks like an underlayer. Also this top is VERY long - good for those of you who are tall, but I'm 5'5" and it is more the length of a tunic top on me. I'm keeping it, but won't be ordering another!
Height:5'5"
Weight:100–125 lbs.
Kait
Chicago, IL
Great top!
4 years ago
I bought this to wear as a layer while running in the Chicago winter. I put it on when I received it and instantly fell in love. I'm 5'9", 140 lbs, and have a long torso - often tops like this are too short and look very boxy on me. This top fits PERFECTLY. It's long, hits below my hips, and fits my silhouette with enough room for a thin merino base layer underneath. It's chilly in my house right now and I felt instantly warm when I put it on, even though it is very thin. I can't wait to go for a run with it on to try it in the elements and I'm excited to try it once the weather warms up, too!
Age:25–34
Weight:125–150 lbs.
Height:5'9"
Yes , I recommend this product
pnwruth
Awesome temp control
3 years ago
I'm someone who gets overheated really easily but also needs good sun protection; thus, the struggle for a longsleeve layer that's not too hot is eternal. This shirt is awesome and fits the bill. I love the material and use the zipper ventilation all the time. I also think it's quite flattering on my curvy body.
Height:5'6"
Age:25–34
Weight:200–225 lbs.
Yes , I recommend this product
Anon
Good for tall people
4 years ago
The fit was way too long for me. I'm 5'2 and 115 pounds so I ordered an XS. The only problem was the length. The material was thin but comfortable.
Height:5'2"
Weight:100–125 lbs.
Barta
Perfect except it didn't fit
2 years ago
Ordered to wear in the Alps this summer. Would have been perfect--light weight, zip to cool off if needed, sleeves long enough, and length would work for shorts or pants w/ any waist. It was just too tight around the torso. It was skin tight so had to return it. I'm at 140 lbs. Couldn't go up to a larger size since shoulders, sleeves and length would be off. Rats!
Height:5'6"
Age:65–74
Weight:125–150 lbs.
Yes , I recommend this product
Minnie80524
Signal Mountain TN
So comfortable and looks great
4 years ago
I bought the xs size. I'm 5'4" and 105lbs but curvy. This shirt fits snugly but doesn't feel tight. Flattering fit and I love the zipper. It has a bit of a mesh look so it might be see-through in the right light. Perfect for a spring hike or jog.
Height:5'4"
Age:35–44
Weight:100–125 lbs.
Yes , I recommend this product
janet
1 year ago
Love this top. It is very soft, lightweight and the half zip comes up to a comfortable level. The only problem is the top is long. I am petite-ish and am used to tops being a bit long, but it is way longer than most regular women's tops. If you're tall, it may be perfect.
LizVet
Lake Tahoe
too long
4 years ago
But of an odd fit. Very long body length. Also much warmer than I expected for a lightweight top.
Height:5'3"
Age:25–34
Weight:100–125 lbs.
No, I do not recommend this product
chickenparm
Great base layer top
4 years ago
The material on this is great! Extremely lightweight and breathable but still keeps you warm on an overcast day. I’m 5’4” 115lb with a slim athletic build and got an XS - it fits great!
Height:5'4"
Age:18–24
Weight:100–125 lbs.
Yes , I recommend this product
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