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  • Made of a soft polyester that wicks sweat and dries fast
  • Flatseam construction, raglan sleeves and side gussets are comfortable as you move
  • Lower back hem stays tucked when you stretch
  • Fitted


View all REI Co-op Women's Long Underwear Tops

REI membership


Best Use Multisport
Shirt Style Crew
Fabric Polyester
Moisture Wicking Yes
Quick Drying Yes
Underwear Weight Lightweight
Sleeve Length Long Sleeve
Gender Women's

Size chart

Sizing notes

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 and ¾ inch shorter in total rise. TALL: tall sizes are 3 inches longer in inseam and 1 inch longer in total rise.

Rated 5 out of 5 by from Comfortable fit and feeling I bought this as a base layer for hiking in Alaska and was not disappointed. I wore it on a long and tough 8 mile hike up and up and up. It rained on us a bit but the base layer stayed comfortable and warm enough, but not too warm that I wanted to take it off. It washed up real nice and dried quickly overnight. Great product.
Date published: 2016-09-11
Rated 5 out of 5 by from Excellent base layer This shirt is great for layering under sweaters in sub20 temperatures, and also great for wearing solo on the climbing wall. Dries fast, though may be slightly tight around the chest for those with big busts (36D, 135lb. M was fine). Probably not enough to size up though. I highly recommend this top!
Date published: 2017-03-21
Rated 5 out of 5 by from Being warm The therma shirt from REI (light weight) is excellent to keep you warm for the cold Bay Area weather. I walked the dog early in the morning and the extra layers have been beneficial.
Date published: 2017-01-11
Rated 5 out of 5 by from fits right, keeps me warm and dry i wore it on a hike, and it was rainy, sunny, warm, cool, and everything in between so I wore this as a base layer. I'm 5'8 and 135 and I got a small. arms are ok length too
Date published: 2017-03-14
Rated 5 out of 5 by from great fit great, fit; as expected. material is lightweight, warm, and much softer than other brands of athletic-wear. washes easy and holds shape well.
Date published: 2017-01-11
Rated 4 out of 5 by from Great Top for Hiking On my most recent REI excursion, I came across this top and loved the feel of the fabric. I found the Small to be snug through the shoulders/chest, and loose elsewhere, but this is relatively typical having a more athletic build. It was the perfect weight for my recent trip to Seattle, hiking around Deception Pass in ~60deg weather.
Date published: 2017-05-02
Rated 5 out of 5 by from Great top for sleeping in hotter climate I was looking for lightweight long johns in order to keep my sleeping bag clean. These are great...fitted, but still loose, nice feel, breathes. It's very hot most of the year, especially when I have to have a rain fly on the tent, but I've never felt overheated at night wearing long sleeves and pants.
Date published: 2017-06-03
Rated 5 out of 5 by from Great for cold weather running I bought this about 2 months ago, and have been using it for outdoor running in MN. This layer stays comfortable on runs averaging about 5 miles. The material is great the fit is loose yet flattering. Paired with a fleece and soft-shell I've had great luck with this item.
Date published: 2017-03-09
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How much does this top actually weigh in ounces?

Asked by: midwest mountains
This top weighs 5 ounces.
Answered by: REIservice
Date published: 2017-05-30

Does this have thumb holes in the sleeves?

Asked by: Slarm1
No, the women's Lightweight Base Layer Crew Top does not have thumb holes.
Answered by: REIservice
Date published: 2017-05-30
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