REI Co-op  Merino 185 Long-Sleeve Half-Zip Base Layer Top - Women's

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Color: Cabin Wood
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Naturally odor resistant, the ultrafine merino wool of the soft, breathable women's REI Co-op Merino 185 long-sleeve half-zip base layer top is ideal for sweating on the trail—and sleeping in a tent.


  • Ultrafine 185 g merino wool offers a soft feel without any itchiness
  • Made with 100% merino wool that naturally breathes, wicks away sweat, dries quickly and resists odors, making it an ideal multiday trip companion
  • UPF 30 sun protection
  • Half-zip front helps with venting; standing collar and chin guard for protection
  • Flat seams and merrow stitch construction eliminate chafing
  • Underarm gussets allow full range of movement
  • Designed to hug the body for optimum performance
  • Weight: 6.8 oz. (size Medium)
  • Machine wash warm, gentle cycle, with wool wash product; do not twist or wring; remove promptly; do not bleach; tumble dry low; dry cleaning not recommended
  • Field-tested on its own and as a base layer while hiking, running, rock climbing, cycling, skiing and camping in diverse climates across the U.S.
  • Made in a Fair Trade Certified™ factory
  • REI is Climate Neutral Certified; as we work to actively reduce our footprint, we measure annual carbon emissions and purchase an equivalent amount of verified carbon credits


View the REI Co-op Merino 185 Product LineView all REI Co-op Women's Base Layer Tops

Technical Specs

Item #192861
Best Use


Shirt Type



Merino wool

Sun-Protective Fabric


UPF Rating


Moisture Wicking


Quick Drying


Underwear Weight


Sleeve Length

Long Sleeve




Fair Trade Certified™ factory

From a Climate Neutral Certified brand

Size Chart

Numerical Size000-24-68-1012-14161820-2224-2602468101214161820222426
Sleeve Length29.53030.53131.532.533.533.534.5303030.530.5313131.531.532.533.533.533.534.534.5

Sizing Notes

Measurements are stated in inches unless otherwise indicated. Some women's pants are available in petite and tall sizes. Typically petite sizes fit women 4'11" to 5'3". Regular sizes fit women 5'4" to 5'8". Tall sizes fit women 5'9" to 5'11".

PETITE: Generally, as compared to regular sizes, petite sizes are 2.5 inches shorter in inseam, 1 inch shorter in body length, 1.25 inches shorter in sleeve length and ¾ inch shorter in total rise.

TALL: tall sizes are 3 inches longer in inseam, 2 inches longer in body length, 2.5 inches longer in sleeve length and 1.25 inches longer in total rise.

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

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