How to Choose Base Layers

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Heavyweight base layer bottoms with optimized fabric zones for active performance, the men's Icebreaker 260 Zone leggings are a reliable technical option for cold-weather activity.
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View all Icebreaker Men's Base Layer BottomsBest Use | Snowsports Multisport |
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Fabric | Body: 97% merino wool/3% spandex; panels: 78% merino wool/22% polyester |
Sun-Protective Fabric | Yes |
UPF Rating | 20 |
Moisture Wicking | Yes |
Quick Drying | Yes |
Fly Opening | No |
Underwear Weight | Heavyweight |
Inseam (in.) | 29.5 inches |
Gender | Men's |
S | M | L | XL | XXL | XXXL | |
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Chest | 33-36 | 36-39 | 39-42 | 42-45 | 45-48 | 48-52 |
Waist | 27-30 | 30-33 | 33-36 | 36-39 | 39-42 | 42-46 |
Hip | 34.5-37 | 37-39.5 | 39.5-42 | 42-44.5 | 44.5-47 | 47-50.5 |
Measurements are stated in inches unless otherwise indicated.
CHOOSING THE RIGHT SIZE: If your body measurements are midway between two sizes, select the smaller size for a tighter fit or the larger size for a looser fit. If your body measurements result in different sizes, we recommend using your chest measurement for tops and your hip measurement for pants.
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Excellent base layer for cold conditions. I find it too warm if temps are above the thirties. Great moisture wicking. Great odor control, can wear it for a couple of runs between washing. I bought it in large because medium was unavailable but it fits well; I have the top in medium which fits well and presume that the medium leggings would also fit well.
Wore these most recently on a 4 day trip in Yosemite where temps were in the low 20's. Kept me warm, and didn't hold onto odors. The best thing about them is they did not slip down while I was sleeping. For some reason, other brands have migrated while sleeping causing, no issue here.
When I trekked in West China, such as Tibet or Sichuan, it was so cold when the altitude is more than 4000m, and I got so much sweat here, my base layer will become so smelly, the IB won't and keep me warmer.