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Alpine Onset 150 Merino Wool Blend Base Layer Pants

Outdoor Research

Current Price $99.00
Color
Color: Black Heather
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Details & care

Stay warm on your next adventure in these odor-resistant, moisture-wicking base-layer pants made from a non-mulesed merino-wool blend.

  • 30" inseam; 10" leg opening
  • Elastic waist
  • Moisture-wicking fabric engineered for dryness and comfort
  • Merino wool naturally resists odors and helps regulate body temperature for comfort
  • UPF 30+ sun protection
  • 53% merino wool, 42% polyester, 5% elastane
  • Machine wash, line dry
  • Imported
  • Item #11076551
  • Core Product ID 3333344X6R

Size info

  • XS=0-2, S=4-6, M=8-10, L=12, XL=14-16, XXL=18.
  • Get the fit you want. Book an appointment with our onsite experts or stop by your nearest store.

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Reviews

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Sept 12, 2026

Perfect for Thick(er) Thighs

I've been using these for over a year, and they are the best base layer I've ever had! As a 5' 4" woman with thick thighs, these fit me perfectly, as every other brand I tried was way too tight around the waist/hips. Plus, it doesn't retain stink like other materials. I've consistently worn these backpacking and hiking, and they have the perfect amount of stretch to move freely, and no holes or rips after hundreds of miles!
Backpacker91566
Mar 4, 2026

Best base layers

Excellent base layers for all kinds of conditions. They run a bit big but they still fit. Soft versatile material.
Emichi
Dec 2, 2024

Great as pajamas!

Purchased the top and bottoms and LOVE them. Use them as pajamas and they're great for travel and multiple wears without getting stinky.
Verified purchase
RicTicBee
Nov 17, 2024

Perfect merino base layer

Extra comfy and warm merino base layer! The waist band is nice and holds the pants in place. The ankles have a seam so they are tight fitting. Really comfortable and run pretty true to size. I’m 5’6, 135 lbs and have a medium. Recommended!
kefar110