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  • Made of a soft polyester that wicks sweat and dries fast
  • Tall neck extends coverage; zipper with chin guard lets you adjust ventilation
  • Flatseam construction, raglan sleeves and side gussets are comfortable as you move
  • Longer back hem stays tucked when you stretch
  • UPF 35 sun protection
  • Fitted


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

REI membership


Best Use Multisport
Shirt Style Zip-front
Fabric Polyester
Sun-Protective Fabric Yes
UPF Rating 35
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 Wears really well, soft and versatile. I bought this top along with an Omni Heat and an Ice Breaker smartwool top in the same half zip design for a trip to Iceland. This was by far my top of choice. It layers really well, has a flattering fit and feels nicer than the other two on the skin around your neck when the zip is pulled up. The collar lays well flat or standing up and you never feel the zip on the inside. It is soft, cozy and versatile. In black it goes well with jeans and a smarter appearance; the logo is hidden on the back making it less obvious. I hiked and camped in this top and it wicked away moisture well always feeling clean and dry. It packs away very small and is lightweight- a perfect addition to any camping trip.
Date published: 2016-09-01
Rated 5 out of 5 by from Awesome base layer for an awesome price! I bought this baselayer top and the coordinating bottoms for a trip to Iceland. I was surprised at how warm they were, given the price was very affordable. I'm naturally warm natured, and this baselayer kept me very warm. I wore it with a Columbia 3 in 1 jacket to go glacier hiking and it definitely kept me warm. At one point I was so toasty that I was able shed both my jackets and only wear the baselayer top for a awhile, until the temperature started to drop. I also wore these baselayers on a whale watching excursion, and the only part of my body that started to get chilled was my face (it was exposed) and my hands. This is a high quality top for the price and makes a great purchase! The fabric is very soft and comfy!
Date published: 2016-10-03
Rated 5 out of 5 by from Perfect! This was absolutely perfect. Light enough to wear under other dri-fit or moisture wicking shirts to keep warm without the bulk but definitely enough to wear on its own comfortably. Wore this as a base layer hiking the Narrows in Zion and stayed incredibly warm and cozy!
Date published: 2016-10-30
Rated 2 out of 5 by from Skimpier than previous one... I loved the previous 2 of this same top that I own so ordered another one the same Medium size. I fits tighter to my body and the neck is so small I cannot zip it up all the way and be comfortable. Very disappointed as I live in the shirts. If you buy it get a size larger. I am giving mine away!
Date published: 2017-02-16
Rated 5 out of 5 by from It's very comfortable and cool. Even in hot days. I'm so happy:) with my purchase . I'll be looking for more products similar next time I visit the store
Date published: 2017-04-18
Rated 3 out of 5 by from Fabric mildly constricting I just purchased this shirt for exercise classes and find they fabric doesn't have enough give. It is a little tight across the chest though the rest of the shirt fits well and is long enough for all the bending and stretching.
Date published: 2017-04-16
Rated 5 out of 5 by from Light and soft This REI base shirt is thin, lightweight and surprisingly soft and comfortable. It has an attractive heather pattern in the grey fabric. I wore it as a yoga top on a cold day, it wicked the sweat away quickly and was never hot.
Date published: 2017-02-16
Rated 5 out of 5 by from Simple & Perfect Love REI Base Layer Half-Zip Tops. I own this one and several of the REI Quarter Zip Base Layers. They are durable, quality made, launder well and layer so easily with other sport pieces. They are a must have top!
Date published: 2017-01-23
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Can you post the weight of the garment?

Asked by: Michiganhneybee
​This top weighs 5.6 ounces.
Answered by: REIservice
Date published: 2017-04-06

Is this fabric that same 92% polyester / 8% spandex blend you used in the older version of this product?

Asked by: nkasmar
This top is made from 100% polyester. It does not have any spandex.
Answered by: REIservice
Date published: 2017-04-06
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