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REI Co-op Midweight Sustainability Report

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Sustainability

5/5
Certified
At Better Trail, our team of sustainability experts independently researches every product we cover. We cut through the greenwashing so you don’t have to, digging into product listings, scouring annual impact reports, and directly communicating with brands and third-party certifiers to bring you trustworthy sustainability information that is totally unique to our site. Here’s to keeping it real.
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Ella Hall bio photo
ByMultiple Authors
Sep 09, 2025
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The REI Co-op Midweight is a top sustainability pick, second only to Patagonia’s Capilene Thermal Weight. It is made from 92% recycled and Bluesign-approved fabric. The Midweight is also produced in a Fair Trade Certified factory, as are many other REI products.

At the brand level, REI’s Re-supply program is an excellent example of how companies can extend the lifespan of their products and keep them out of landfills. REI also tracks its carbon footprint as part of its goals to reach a 50% reduction in greenhouse gas emissions by 2030 and net zero by 2050. In the meantime, REI purchases carbon credits to offset its impact and has achieved Carbon Neutral Certification. Furthermore, REI invests in responsible manufacturing through its partnership with Fair Trade USA. Like the Midweight LS, most REI products are manufactured in Fair Trade Certified factories. All in all, the Midweight base layer impressively hits all of our sustainability criteria.

Below, we break down in detail all of the REI Co-op Midweight's sustainability attributes at the product and brand level, including links to in-depth articles on relevant topics. For more, see our guide to the best base layers and our review of the REI Co-op Midweight.

The Midweight features a polyester fabric, which is more durable than all-merino or blended base layers. But despite its 220-gram weight, it lacks the hardwearing nature of more technical and premium polyester base layers.

Choosing durable outdoor gear is perhaps the most effective way to reduce environmental impact—the longer it lasts, the less it needs to be produced. Our proprietary longevity rating evaluates overall build quality based on factors such as materials, fabric denier, component durability (including zippers and toggles), real-world performance as reported by our field testers, and our experiences with the brand. Overall, we feel strongly that reducing overall consumption is a cornerstone of sustainability.

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Base Layers Sustainability Comparison

REI Co-op Midweight ($55)
Certified
5/5
Longevity

Longevity

Recycled Materials

Recycled Materials

Bluesign Approved

Bluesign Approved

Responsible Manufacturing

Responsible Manufacturing

Recycled and/or Reduced Packaging

Recycled and/or Reduced Packaging

Resale and/or Recycling Services

Resale and/or Recycling Services

Carbon Footprint Tracking

Carbon Footprint Tracking

Annual Impact Report

Annual Impact Report

Patagonia Capilene Thermal Weight Zip-Neck ($115)
Certified
5/5
The North Face Summit Series Pro 120 ($90)
3.6/5

Our Sustainability Ratings Explained

4 - 5

These products are among the most sustainable on the market and earn our Better Trail Certified distinction. They often meet 80% or more of our sustainability criteria for their category. 

2.5 - 3.5

These products are solid, middle-of-the-pack options for sustainability. In general, they meet at least half of our sustainability criteria for their category.

0 - 2

These products are among the least sustainable in their product category and have significant room for improvement. Most meet about 25% or less of our sustainability criteria.

Better Trail Certified Process

Better Trail Certified Process

The world of sustainability can be murky, but Better Trail is here to help bring clarity. We’ve exhaustively researched thousands of outdoor gear products, communicated with brands, and created a detailed and rigorous ratings system to bring it all together for you. At the pinnacle is Better Trail Certified.


Better Trail Certified products score 4 out of 5 or higher in our sustainability ratings and generally meet around 80% or more of our criteria. While it’s true that no product is 100% sustainable—all take resources to create and arrive at your doorstep—these products are industry leaders and among the most sustainable on the market.