How to Choose Base Layers

A good day outdoors starts with a good base layer. This soft, synthetic top from REI Co-op provides midweight warmth for comfortable layering on cold days. Thumbholes add a cozy feel.
Imported.
View all REI Co-op Men's Base Layer Tops| Best Use | Multisport |
|---|---|
| Shirt Type | T-shirt |
| Fabric | 92% recycled polyester/8% spandex (bluesign® approved) |
| Sun-Protective Fabric | Yes |
| UPF Rating | 50+ |
| Moisture Wicking | Yes |
| Underwear Weight | Midweight |
| Sleeve Length | Long Sleeve |
| Thumbholes | Yes |
| Gender | Men's |
| Sustainability | Fair Trade Certified™ Factory Contains recycled materials Contains materials that meet the bluesign® criteria From a Climate Label Certified brand |
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I received this REI midlayer for free in exchange for my honest review. I got it during the summer, so I haven't been able to test it in true cold weather yet, but I'm impressed so far. The material is dense, warm, and feels very well made. Even in 80–85 degree weather, I was able to wear it around the water, on trails, and in the fields without feeling overly uncomfortable. It breathes better than I expected for something this substantial. I also really like the flat stitching, lack of tags, longer sleeves, and overall fit. Nothing rubbed or felt irritating, and the green color looks great in person. My only question is long-term odor retention, since that can be an issue with synthetic materials. I haven't had it long enough to judge that fairly yet. Overall, this feels like a durable, comfortable, thoughtfully made midlayer that should be excellent for colder weather.


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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.

