REI Co-op Midweight Long-Sleeve Base Layer Top - Men's

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Color: Alloy Gray Heather
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Warm and wicking to keep you comfortable on the slopes, the men's REI Co-op Midweight long-sleeve base layer top has a smooth face to ease layering and a brushed back for warmth against the cold.


  • Recycled polyester/spandex fabric wicks moisture to keep you comfortable
  • Spandex adds the right amount of stretch while underarm gussets maximize your range of motion
  • Flatseam construction reduces bulk and chafing
  • Thumbholes hold your sleeves in place and seal warmth in
  • Rolled-forward shoulder seams prevent abrasion from pack straps
  • UPF 50+ rating
  • Back length: 29 in.; Tall sizes: 31 in.
  • Machine wash cold; wash separately, gentle cycle, remove promptly; do not use bleach or fabric softeners; tumble dry low
  • Made using bluesign®-approved materials, which conserve resources and protect the health of the environment, workers and wearer (you!)


View all REI Co-op Men's Base Layer Tops

Technical Specs

Best Use


Shirt Type



92% recycled polyester/8% spandex (150-denier, 220 g/m2; bluesign approved)

Sun-Protective Fabric


UPF Rating


Moisture Wicking


Underwear Weight


Sleeve Length

Long Sleeve






Contains recycled materials

Fair Trade Certified™ factory

Contains materials that meet the bluesign® criteria

From a Climate Neutral Certified brand

Size Chart

XSSMLXLXXLXXXL24 IN Waist26 IN Waist28 IN Waist30 IN Waist31 IN Waist32 IN Waist33 IN Waist34 IN Waist35 IN Waist36 IN Waist38 IN Waist40 IN Waist42 IN Waist44 IN Waist46 IN Waist48 IN Waist50 IN Waist
Chest3536 - 3839 - 4142 - 4546 - 4950 - 5354 - 57
Sleeve Length3333.53434.53535.7536.5
Waist27.528 - 3032 - 3436 - 3840 - 4244 - 4648 - 502426283031323334353638404244464850
Hip33.534.5 - 36.537.5 - 39.541 - 4344 - 46.547.5 - 50.551.5 - 54.53233.534.536.53737.538.539.540.2541434446.547.550.552.554.5

Sizing Notes

Measurements are stated in inches unless otherwise indicated.

SHORT: Some pants are available in short sizes, which generally means an inseam that is 2.5 inches shorter than regular sizes.

TALL: Some pants, shirts, jackets and parkas are available in tall sizes, which generally means an inseam that is 3 inches longer and a rise that is 1 inch longer, a shirt or jacket body that is 2 inches longer, a parka body that is 2.5 inches longer and sleeves that are 2.5 inches longer than regular sizes.

Capri or cropped pants have an intentionally shorter inseam—reference the technical specs instead of this chart.

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