How to Choose Base Layers
REI Co-op Lightweight Base Layer Crew Top - Women's
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Comfy as you warm up, comfy as you cool down, comfy when you break a sweat. The women's REI Co-op lightweight base layer top is ideal for hiking, cycling and even sleeping—especially in the summer.
Shop similar products- 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
- Flatseam construction is comfortable against your skin
- Lower back hem stays tucked when you stretch
- UPF 50+ sun protection
- Semi-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
- Contains materials that meet the bluesign® criteria
Imported.
View all REI Co-op Women's Base Layer Tops| Best Use | Multisport |
|---|---|
| Shirt Type | T-shirt |
| Fabric | 92% polyester/8% spandex (bluesign approved) |
| Sun-Protective Fabric | Yes |
| UPF Rating | 50 |
| Moisture Wicking | Yes |
| Quick Drying | Yes |
| Underwear Weight | Lightweight |
| Sleeve Length | Short Sleeve |
| Gender | Women's |
| Sustainability | Contains materials that meet the bluesign® criteria 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.
Buying Advice
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From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.
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Most Helpful Favorable Review
Runs smaller than previous years
seahills2 years ago
I had previously purchased 2 of these base layer shirts in medium that fit me well. The tags on those are dated Nov21. This shirt has a tag of Oct22 and is much tighter in the chest, arms, and shoulders.
seahills
Seattle
18 people found this review helpful
Most Helpful Critical Review
Runs smaller than previous years
seahills2 years ago
I had previously purchased 2 of these base layer shirts in medium that fit me well. The tags on those are dated Nov21. This shirt has a tag of Oct22 and is much tighter in the chest, arms, and shoulders.
seahills
Seattle
18 people found this review helpful
seahills
Seattle
Runs smaller than previous years
2 years ago
I had previously purchased 2 of these base layer shirts in medium that fit me well. The tags on those are dated Nov21. This shirt has a tag of Oct22 and is much tighter in the chest, arms, and shoulders.
Marie F
Salem, Oregon
Love this shirt
2 years ago
Great shirt for the outdoors!! It is a little thicker than say a running shirt, but still dries quickly and it’s well made. Fits true to size. I’m 5’3” and about 130lb and swear size small.
Age:25–34
Weight:125–150 lbs.
Height:5'3"
Yes , I recommend this product
Caren
Beautiful color
3 years ago
Shirt fits great across the shoulders and the shirt is little long, but that’s fine because it gives good coverage. I got a xs, I’m 5’4”, 120 lbs, chest is 33.
Height:5'4"
Age:25–34
Weight:100–125 lbs.
Yes , I recommend this product
Itrainsherealot
Seattle
Runs small for REI
2 years ago
The shirt is very lightweight and has a feminine shape through the body which I like. It fits smaller than other REI tops that I own. For reference I am 150 lbs, 5’5 and a medium felt right. I always buy medium tops in the REI brand and this is the first one that feels smallish.
Height:5'5"
Age:45–54
Weight:150–175 lbs.
Yes , I recommend this product
LynnieH
TEN MILE HIKE AND STILL COMFY
4 years ago
After a grueling ten mile hike this shirt wicked the sweat off and was still feeling great at the end. I am very happy with this purchase.
Age:65–74
Weight:125–150 lbs.
Height:5'1"
Yes , I recommend this product
Lola3
Runs Small
1 year ago
The top runs small. If you are slim and smaller on top, it will probably fit okay. I purchased a medium and it was too tight. It's too bad because I like the color and fabric. I purchased another REI top in medium and it was fine.
Brenda
MI
Too long, too tight at bottom for me.
2 years ago
I liked the fabric, but too tight in waist/hip area. It's long, and has good coverage for your bum, but needs to be style more A-line for my body type.
Age:55–64
Weight:125–150 lbs.
Height:5'6"
No, I do not recommend this product
TNT
San Jose, Ca
Not for me
1 year ago
Great color green. I am a medium but I sized up to large because I like these shirts a bit baggy. However the sleeve hung low at the armpit and when I lifted my arms my belly was showing. For me, didn’t like the fit do to sleeve not cut like a regular t-shirt.
Height:5'4"
Age:55–64
Weight:100–125 lbs.
ReneeB
Lynnwood, WA
Great for skiing base layer!
3 years ago
This shirt is very comfortable and kept me comfortable and warm, yet not hot or sweaty. It is snug at first yet you can move freely. It loosens a bit, yet not overly so. I ordered a large. I highly recommend it.
Age:45–54
Weight:150–175 lbs.
Height:5'8"
Yes , I recommend this product
Gypsy Kim
Rainsville, Al
Great shirt for outdoor activities and exercise!
1 year ago
Love, Love these shirts! I have several colors and use them primarily as hiking shirts and for light wt layering. They are cool, don't stick to your sweaty skin, dry quickly if you get wet and they look nice on. Also Love that they have a split hem on the sides and that they are not form fitting. I own 4 ss and 3 ls and about to purchase 2 new colors. Can't go wrong with this shirt by REI!
Age:55–64
Weight:125–150 lbs.
Height:5'2"
Yes , I recommend this product
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