REI Co-op Merino Midweight Base Layer Bottoms - Kids'
This product is not available. Good news: we have a newer version.
Soft, moisture-wicking 100% merino wool makes the kids' REI midweight base layer bottoms ideal for cold-weather kids' fun like skiing, hiking and snowshoeing.
Shop newer version- Mineral-based LAVA™ finish keeps fabric odor-free
- Flatseam construction, low-profile waistband and crotch gusset keep youngsters comfortable as they move
- UPF 50 sun protection
- Fitted
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
- Made in a Fair Trade Certified™ factory
Imported.
View all REI Co-op Kids' Base Layer Bottoms| Best Use | Multisport |
|---|---|
| Fabric | Merino Wool |
| Sun-Protective Fabric | Yes |
| UPF Rating | 50 |
| Moisture Wicking | Yes |
| Quick Drying | Yes |
| Underwear Weight | Midweight |
| Gender | Girls' Boys' Kids' |
| Sustainability | Fair Trade Certified™ Factory From a Climate Label Certified brand |
| XXS | XS | S | M | L | XL | |
|---|---|---|---|---|---|---|
| Numerical Size | 5 | 6-7 | 8 | 10 | 12 | 14 |
| Height Range | 45 | 47 1/2 - 50 | 52 | 57 | 61 1/2 | 65 1/2 |
| Across Shoulder | 11 | 12 1/4 | 13 | 13 1/2 | 14 | 14 3/4 |
| Chest | 23 | 24 - 25 | 26 - 27 | 28 - 29 1/2 | 30 1/2 - 31 1/2 | 32 - 33 |
| Sleeve Length | 21 | 22 - 23 1/2 | 24 - 25 | 26 - 27 | 27 1/2 - 28 1/2 | 29 1/4 - 30 1/4 |
| Waist | 21 1/4 | 22 - 23 | 24 - 25 | 26 - 27 | 27 1/2 - 28 1/2 | 28 3/4 - 29 3/4 |
| Hip | 23 3/4 | 24 1/4 - 26 1/4 | 27 - 28 | 29 - 31 | 32 - 33 | 34 - 35 |
| Inseam | 19 | 21 - 22 3/4 | 23 - 24 | 25 - 26 1/2 | 27 - 29 | 29 1/2 - 30 1/2 |
Sizing Notes
Measurements are stated in inches unless otherwise indicated. Size chart values represent body measurements, not garment measurements.
Inseam is measured to the floor.
Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.
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Most Helpful Critical Review
Great Base Layer For Cold Play
Love it! Our 6 year old wears the bottoms and tops as a base layer for sledding, outdoor play, and hockey. We live in Minnesota and this winter the snow and cold came early and often and our guy has been out enjoying every minute of it. So far the temps have gotten down to 5 degrees F and he has been comfortable and happy in that weather. Fit is exceptional. Also works well as a base layer for hockey practice. If you're reading this part and thinking "ok", then your child will be warm and happy with just these. Great fit and allows full and comfortable range of movement. And warm! Best long johns we've gotten for our winter guy yet.
Itchy
These will get the job done. They're warm, but they're incredibly rough and itchy like the wool you were afraid of as a kid. They are a bit baggy around the waist and the elastic is quite stiff.
Kids 14-16 fit a woman who wears size 8
Biggest kids size 14-16 EVER! My wife fit them. Sizing seemed to be way off...beware...be warned
Actually used for an adult!
XxS female- fit perfectly - for my mother - in - law
Thumbs up from my daughter
My daughter is quite happy with her new long undies. She described them as comfortable, warm, and not itchy. She also thinks the color is really pretty. They seem well made and I have hopes these will hold up for several years across my two children, used primarily during ski season and to stay warm at night camping.
Substantial and soft enough
Bought these because they are more substantial than Smartwool. My kids have worn them for two years now with no complaints. We hike and camp in winter and I appreciate the extra protection keeping my kids safe.
Easy to layer and have held up well this winter
My boy (4 and 5 years old) have been wearing these bottoms, with the matching tops, all winter long here in the Boston area. These are our favorite base layer - merino wool is expensive, but worth it. So comfy that they often end up wearing it all day long after stripping off snow gear. I joke that I shouldn’t have bought them any real clothes this winter - just several sets of this base layer :)
Terrible Quality: Developed a Hole within 2 weeks
After relatively light usage by my son the pants developed a huge hole around the knee area within 2 weeks of purchasing.
Great Base Layer or PJs
These wool pants are great. My daughter is tall and skinny and the pants are long enough while still fitting her waist. She regularly wears them for PJs around the house. In the summer they're cool enough for her to wear as hiking pants, but great in winter as a base layer. She loves them, we have 2 pairs and will be adding more this fall.
Perfect for a small woman!
I'm a petite adult female (5'3 size 2-4) and it fit perfectly. Nice midweight baselayer. Definitely happy so far with this purchase.