REI Co-op Lightweight Base Layer Half-Zip Top - Men's
![](https://i.ytimg.com/vi/v86Du3U58fQ/maxresdefault.jpg)
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First half-mile cold; next 3 miles sweaty; lunch break cold. Don't stress—the REI Co-op lightweight half-zip long-sleeve base layer wicks and breathes to keep you comfortable all day.
![](https://d1nymbkeomeoqg.cloudfront.net/photos/29/8/412363_23705_XL.jpg)
The 5 Best Base Layers of 2024
![](https://images.backpackers.com/i/400/-/9ecb8f10430c1e74add9b791fbec021f/backpackers.com/wp-content/uploads/2019/10/rei-midweight-fleece-380x450.jpeg)
Sustainability Matters: REI Leads with Environmental Standards and
![](https://www.thebrokebackpacker.com/wp-content/uploads/2020/05/gear-roundups-best-layers-pin.jpg)
14 Best Base Layers for Men and Women of 2024 (Buyer's Guide)
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SEA HALF ZIP TOPS / ASH - L
![](https://hips.hearstapps.com/vader-prod.s3.amazonaws.com/1701186643-2873669e-36a9-4189-b7d3-b1efe362-1-65660c4a6b9bb.jpg?crop=1.00xw:0.751xh;0,0.249xh&resize=980:*)
Best Thermal Underwear for Men in 2023: 14 Pairs of Men's Long Johns
![](https://cdn.mall.adeptmind.ai/https%3A%2F%2Fimages.lululemon.com%2Fis%2Fimage%2Flululemon%2FLM4AL5S_062386_3_640x.webp)
Lululemon lab Lightweight Ripstop Jacket, Men's Coats & Jackets
REI COOP Base Layer Quarter zip Midweight Long sleeve Size Medium
![](https://i.ytimg.com/vi/v86Du3U58fQ/maxresdefault.jpg)
REI Co-op Lightweight Base Layer Half-Zip Top - Men's
REI Co-op Lightweight Base Layer Half-Zip Top - Men's
![](https://res.cloudinary.com/yerdle/image/upload/w_900,h_900,c_fit,q_auto:eco,f_auto/v1670782994/production/partners/3/catalogItemImageCache/dtlcumtoh4ctttxlw74h.jpg)
Used REI Co-op Merino Midweight Half-Zip Base Layer Top
REI Co-op Lightweight Base Layer Half-Zip Top - Women's
![](https://di2ponv0v5otw.cloudfront.net/posts/2022/11/25/6380bb4383cbecda23c40ead/l_6380bb617f29dd68cf7eece4.jpg)
Rei Base Layer - Gem
![](https://i.pinimg.com/736x/89/31/f2/8931f269f1f6937e539054f19718337d.jpg)
REI Co-op Lightweight Base Layer Half-Zip Top - Men's