REI Co-op Lightweight Base Layer Long-Sleeve Crew Top - Women's

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Comfy as you warm up, comfy as you cool down, even comfy when you break a sweat—the women's REI Co-op lightweight long-sleeve base layer top is ideal for skiing, hiking and lunch break, too.

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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
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	T-shirt
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.

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

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.

Ratings Snapshot

Product Rating

4.1

View the reviews with an average rating of 4.1 out of 5 stars179 Reviews

68 out of 97 (70%) reviewers recommend this product

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Most Helpful Favorable Review

5 reviews with an average rating of 5.0 out of 5 stars

outabout

1 year ago

Very comfortable top and warm. I wore it camping last week in the mountains.

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outabout

60 people found this review helpful

Most Helpful Critical Review

5 reviews with an average rating of 3.0 out of 5 stars

Very different from prior generation

BlazeJester

3 years ago

I purchased the prior version of this shirt a couple years ago, maybe 2 at most. The product description doesn’t make it clear that it’s different now and it’s impossible to tell from the photos. The prior version was a solid knit, similar to the mid weight. That one fits me beautifully and is very flattering, comfortable, basically like having nothing on. This newer version is nothing like it. The photos capture it very poorly… the material has offset “vents” every 1/4” or so that are minimally threaded, rather than the entire fabric being the same thickness. It makes the material feel delicate like it might tear if snagged in the thinly woven spots, and it’s also a much rougher fabric on the skin. The shirt itself is a more snug fit so the perfect XL of the older shirt is now unflattering and tight. None of those changes is positive for me. Hate that REI continues to discontinue great products that work well for tons of people. Product discontinuation in favor of what’s shiny is the most hated thing about shoe companies… it’s a bad bandwagon to be riding, REI.

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BlazeJester

Longmont, CO, USA

46 people found this review helpful

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Lisa

Seattle, WA

Rated 1.0 out of 5 stars

2 years ago

I ordered the REI Lightweigh Base Layer Crew in Rose Currant Heather and Purple Haze Heather, both a Large. I am returning both because the material is not great for normal wear, almost like basketball shorts material? It has holes throughout and is oddly shiny. And it looks ok in the photos but felt baggier than I like. I’m 5’6”, 37” bust, 30” waist, 45” hip and I think a medium would have fit better.

Age:35–44

Weight:150–175 lbs.

Height:5'6"

No, I do not recommend this product

Overall Fit Rating

Runs SmallRuns Large

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Leah

Salt Lake City, UT

Rated 5.0 out of 5 stars

5 years ago

I got this shirt specifically for a backpacking trip through the Grand Canyon as my hiking shirt. I was looking for sun protection with long sleeves but that could be work in 100+ degree heat 4 days in a row. This shirt was perfect. Was great in the heat and getting in the water whenever we could to cool down. Fits true to size.

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1FootNsitE

North Puget Sound

Rated 5.0 out of 5 stars

5 years ago

What stands out about this top compared to many others available is the longer length, tailoring in the waist, rounded hem, and plenty of room in bust. Fabric is soft and light. I bought this to work out in gym and it certainly works great for that. It does seem to wrinkle easily so pull it out of the wash machine right away and hang to dry. I paid full price and I feel for this type of top it is a bit pricey. The only color I really liked was the darker gray color. I wear 34F/G bra and bought the Large which was a good fit without being tight.

Yes , I recommend this product

Helpful?

hikesforchocolate

Rated 3.0 out of 5 stars

1 year ago

I liked the lightweight, breathable material and the raspberry color, but the fit was awkward, so I'm taking it back. I tried two sizes since my tall frame (5'9", 145lbs) makes women's sizes hard to predict. The medium was snug in the body and across the shoulders and the sleeves ended a full inch above my wrist. The large size was better in the sleeves but was sort of extra-large where the arms met the torso, which made the shirt pull and gape strangely between the chest and armpits. Both sizes were too long for my taste - I think that's the style now but it doesn't work for me for a fitness shirt.

Height:5'9"

Age:45–54

Weight:125–150 lbs.

Helpful?

AnnieG

Jersey Shore

Rated 5.0 out of 5 stars

4 years ago

I found this in the store and loved the fit. I'm 5'9" and 122 lbs so I have a hard time finding the right proportions of long and narrow. My regular clothing size is a XS but I went with the S to get the extra length and shoulder width. It is rare for me to find a top that is long enough to stay tucked in or not expose my back if untucked. It fits well around the arms and shoulders, too, not bunching up in the armpits. I bought the gray. I find the other colors kinda weird and wish they made it in different/more colors because I would buy several of them if they did.

Height:5'9"

Age:45–54

Weight:100–125 lbs.

Yes , I recommend this product

Helpful?

BlazeJester

Longmont, CO, USA

Rated 3.0 out of 5 stars

3 years ago

Age:35–44

Weight:175–200 lbs.

Height:5'8"

No, I do not recommend this product

Overall Fit Rating

Runs SmallRuns Large

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Casey

Salt Lake City, UT

Rated 5.0 out of 5 stars

1 year ago

This has been my go-to base layer for skiing for two seasons, and it can't be beat. This is my third time purchasing since I loved my first purchase so much. I generally wear this top under a micro-grid fleece and my shell and am plenty warm and dry. The cut is super flattering (fitted without limiting movement or being too tight in the wrong places) and I love the color options and the addition of new ones each season. This base is great at wicking moisture, and I never feel super sweaty or gross after skiing. Personally, I tend to run hot so this base plus a fleece is perfect for me. I also just wear it casually out under a vest in cool weather. I'd highly recommend it for your base layer needs this winter.

Age:25–34

Weight:125–150 lbs.

Height:5'6"

Yes , I recommend this product

Overall Fit Rating

Runs SmallRuns Large

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SParris

Rated 5.0 out of 5 stars

4 years ago

Purchased this to take on a trip to UT to see Canyonlands and Arches National Parks. True to size and long (which I like!). This is the perfect long sleeve layer under a vest or jacket! Thanks REI!

Age:25–34

Weight:125–150 lbs.

Height:5'5"

Yes , I recommend this product

Overall Fit Rating

Runs SmallRuns Large

Helpful?

Balticat

Baltimore MD

Rated 1.0 out of 5 stars

3 years ago

Very strange fit. I went up a size and got a large and it's fine on top but very narrow through the hips. The cut is very long and goes below my butt, so the tightness around the hips is more exaggerated and awkward. I suppose if its a shirt you plan to always tuck in or have narrow hips, this wouldn't be a problem but it's not going to work for me. It's unfortunate because the material seems nice and lightweight and was what I was looking for as a transitional season top.

Age:35–44

Weight:125–150 lbs.

Height:5'5"

Overall Fit Rating

Runs SmallRuns Large

Helpful?

Active gal

Rated 5.0 out of 5 stars

4 years ago

I am 5'3", 125 lbs and bought several in medium. It just covers the tush (which I like). Wear them as tops (medium for me is loser fitting, though not baggy, sloppy lose), or base layer with vest or jacket etc. If one prefers a more body fitting base layer, perhaps order small. It has a nice design, more fitting at the top (so ya don't look frumpy) with minimal flare (though not too much) at the lower body. I am slender though lift weights so muscular.

Height:5'3"

Age:45–54

Weight:100–125 lbs.

Yes , I recommend this product

Helpful?

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REI Co-op Lightweight Base Layer Long-Sleeve Crew Top - Women's

Features

Technical Specs

Size Chart

Sizing Notes