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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.
REI Co-op Lightweight Base Layer Half-Zip Top
REI Co-op Lightweight Base Layer Long-Sleeve Zip-Neck Top - Men's
REI Co-op Lightweight Base Layer Half-Zip Top - Men's
REI Co-op Lightweight Base Layer Long-Sleeve Crew Top - Men's
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REI Co-op Lightweight Base Layer Half-Zip Top - Men's, REI Co-op
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REI Co-Op Lightweight Base Layer Men's XL Black Poly Knit Half Zip
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SEA HALF ZIP TOPS / ASH - L
REI Co-op Women's Lightweight Base Layer Half-Zip Top Long Sleeve