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Outdoor Research
Alpine Onset Bottom - Women's

3.823529411764706 out of 5 stars
17 Reviews
Current price: $31.13 - $44.48 Original price: $88.95
Up to 65% off


Size Chart


Why We Like The Alpine Onset Bottom

No matter if we're tailgating in a parking lot with a group of our favorite people or skinning up a well-beaten track with our skis underfoot, the Alpine Onset Bottom will keep us from feeling the chill in the air. This layer is made with merino wool that's naturally odor-resistant for staying fresh and highly comfortable for all-day wear. With a fit and construction that features next-to-skin softness and zero chafing, the Alpine Onset Bottom is ideal for days when we need a bit of extra warmth without sacrificing comfort or freedom of movement.


  • Merino wool base layer for active movement and total comfort
  • Highly breathable so we can stay warm without getting too toasty
  • Wicking fabric keeps us dry when we're sweating it
  • Lightweight and naturally odor-resistant for keeping fresh
  • UPF 33 for protection from harsh ultraviolet rays
  • Item #ODRZ8IX
47% merino wool, 47% Repreve recycled polyester, 6% elastane jersey
Insulation Weight
natural attribute of merino wool
UPF Rating
Claimed Weight
skiing, snowboarding
Manufacturer Warranty

Overall Rating

4 based on 17 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 3 reviews
3 Stars - 1 reviews
4 Stars - 5 reviews
5 Stars - 7 reviews

What do you think about this product?


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3 out of 5 stars

March 20, 2024

works for casual activities

Good things about these pants 1- These pants are nice and warm 2- Fabric is durable and comfortable (it takes a few wears/washes) 3- The pants aren't see through, but I did get a dark color why I dont love these pants 1- the fabric isn't very flexible. While possible, these pants make it hard to get full ROM at the knees 2- the waist sits low and likes to ride down. This adds to the difficulty of bending my knees, I feel like I have to pull these pants up every time I squat or sit down. 3- the seam near the ankle digs in like crazy with ski boots. It only took one run to notice the rubbing and the seam was painful by the end of the day. 4- length. I'm 5'10 and these pants fall a couple inches about my ankle. But for most people I'd imagine the length is just fine 5'10 athletic build ordered size M


Originally reviewed on

2 out of 5 stars

January 21, 2024

Doesn't feel good

Got this for my wife and she had to return it because the material doesn't feel very nice against the skin and rides up. There are better merino base layer bottoms on the market.


Originally reviewed on

5 out of 5 stars

January 20, 2024

Great color. Comfortable and cozy.

Very comfortable and cozy. Great for lounging around the house and also for layering for hiking, camping and skiing. Go to layer for leight weight warmth. Love the color too!


Originally reviewed on

1 out of 5 stars

December 20, 2023

Wrong fit - cannot recommend based on fit

I wanted to love these pants so much! They aren't stretchy, but I feel like functional movement in the legs is fine. The waistband is way too loose and they fall off my body. Unfortunately, I won't be able to wear them on a snowboard trip to Japan as I can't spend my whole day trying to keep them from falling down. Maybe I can take in the waist myself?


Originally reviewed on

2 out of 5 stars

December 17, 2023

Very unstretchy

I wanted to love these, but I can't believe how unstretchy they are! I was going to use them for activities like under pants for climbing or hiking when cold, but there's no way these would feel good for that. They restricted movement too much.


Originally reviewed on

5 out of 5 stars

December 10, 2023

Light, strong and soft.

The bottoms are super comfy, fit well and seem like they are durable. The bottoms were a little scratchy right out of the package, but are much softer after a wash.


Originally reviewed on

5 out of 5 stars

August 30, 2023

I took these to the North Pole and worked great

I used these under windproof shells to run the North Pole marathon in summer 2023. The temps were upper 20s with light wind and sunny. These provided just enough insulation without being too hot. I recommend these for any active outdoor activity under a windproof/waterproof shell.

VT runner

Originally reviewed on

5 out of 5 stars

February 4, 2023

Perfect for layering!

Super lightweight base layer, you never felt bulky! Bought the set in snow camo too! They kept me warm.


Originally reviewed on

5 out of 5 stars

November 23, 2022


Very soft and comfortable, fits well. Use this for active outdoor activities in cool/cold temperatures.


Originally reviewed on

2 out of 5 stars

May 10, 2022

It's a no for me...

Scratchiest, weirdest leggings I have ever owned. Not stoked on the blend. I'm in between two sizes so sized up. Not stoked on the fit around the belly. Only think I really like about it is the blue camo pattern. Guessing the material will be durable but after one wash it's still stiff as heck. Would not purchase again.


Originally reviewed on