How to Choose Base Layers

A synthetic base layer for moderate temps, the women's REI Co-op Lightweight Short-Sleeve Crew keeps you dry and comfortable whether you're venturing into the mountains or trekking across open desert.
Imported.
View all REI Co-op Women's Base Layer Tops| Best Use | Multisport |
|---|---|
| Shirt Type | T-shirt |
| Fabric | 94% recycled polyester/6% 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 Contains recycled materials Fair Trade Certified™ Factory From a Climate Label Certified brand |
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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I purchased this shirt for a hike at Starved Rock. I am typically a M but opted for a large for a roomier feel. The M felt a little tighter on my arms. I love that the shirt has longer sleeves. The fabric is soft and breathable. I am planning to purchase a couple different colors.
Originally, ordered a Lg, which was too snug for what I prefer. Exchanged at store for XLg and really like the material, the fit and the color.
I love this shirt. Perfect for hiking or just wearing out and about on hot summer days. The material is nice, not itchy/scratchy. I like the longer sleeves. Will be buying more in different colors.
Very comfortable. Keeps you cool in the summer. Can be worn under another shirt. Great for traveling.
I like the lightness and comfort of this top. Will be wearing it a lot in the summer.
A perfect hiking and travel shirt. Breathable, comfortable and has great coverage!
love the color fit and style. I like that the sleeves are a bit longer.
Great fit ! Comfortable Exactly What I was looking for.
These shirts are the best!!!! Very comfortable, wash very well, no itch, not tight but not loose...I bought 3 in different colors and I am living in them.
This shirt is ok, but it doesn't fit me quite right. Mainly the neck is very high, which I don't care for, but I should have figured that out from the photo. I got the green/turquoise and the color is nice. I've liked some of the other REI shirts more.