5 Best Base Layers and Thermals

Base layers form a moisture-wicking system that keeps you dry and comfortable against your skin, without adding bulk to your outfit. This makes them a versatile part of any cold-weather wardobe.

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Here are some of the best base layers that can keep you cozy without warming the planet:

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Cotopaxi

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Starting at $80

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Check out Cotopaxi’s Debajo Seamless Baselayer range for your wintery adventures. Available for both men and women, this versatile baselayer is made from 66% recycled nylon, 27% recycled polyester, and 7% spandex. The brand manufactures them in Fair Trade Certified™ factories that have a rigorous code of conduct and prioritize sustainable operating practices. It also has a repair program and offers a lifetime warranty on its products. And here's the best part — when you're done with your gear, just send it back to Cotopaxi and it'll give it a second life through their resale program.

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REI

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Starting at $55

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REI has a range of sustainable base layers that have been field-tested for hiking, running, rock climbing, cycling, skiing, and camping in diverse climates across the U.S. The Midweight Long-Sleeve Base Layer for men and women is made of 92% recycled polyester/8% spandex and is Bluesign® approved. They are made in a Fair Trade Certified™ factory. REI is Climate Neutral Certified and also runs a repair program and a gear rental program. Its take-back program accepts any brand's clothes or shoes for resale.

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Noble

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Starting at $78

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Noble makes clothing for women and kids from 100% GOTS-certified organic cotton that's grown and sewn in Peru. Check out its Adult Organic Waffle Top and Bottom made with organic cotton and eco-friendly dye. You can wear it as a base layer but they are also perfect for everyday wear with jeans or for bedtime. It keeps you the perfect amount of cozy without overheating. Noble uses 100% compostable bags and mailers and also runs a take-back program that accepts its own brand's clothing for resale.

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Patagonia

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Starting at $89

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Another sustainable brand that truly lives and breathes the great outdoors is Patagonia. Its Men's and Women’s Capilene® Midweight Crew and Bottoms are made from 100% recycled polyester. Its hollow-core yarns and diamond-grid back trap warm air, wick moisture, and dry fast. They are also made in a Fair Trade Certified™ factory. Patagonia has a repair program and offers a lifetime warranty. It gives detailed care instructions to help extend the garment's lifespan. It also has a take-back program that accepts its own brand's items for resale.

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Arc'teryx

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Starting at $120

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Arc'teryx has a wide range of base layers for men and women. The most sustainable ones are made of wool. Whether you are on a ski tour, extended backpacking trips, or climbing, the Merino wool fibers will help you with thermoregulation, softness, and natural odor resistance. These wool base layers are Fair Trade Certified and the wool used in them is 100% Responsible Wool Standard (RWS) certified. Similar to other brands on the list, Arc'teryx also provides a lifetime warranty and has a repair and take-back program.

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