How to Choose Base Layers

Made for cold weather, this Icebreaker base layer top has soft fabric to keep you comfy when you're on the move. Offset shoulder seams and flatlock stitching help reduce friction.
Imported.
View all Icebreaker Women's Base Layer TopsBest Use | Multisport |
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Shirt Type | Full-zip |
Fabric | Main body: 60% TENCEL lyocell/40% merino wool; inner collar/pocket lining/side panels: 100% merino wool (exclusive of decoration and elastic) |
Moisture Wicking | Yes |
Quick Drying | Yes |
Underwear Weight | Heavyweight |
Sleeve Length | Long Sleeve |
Thumbholes | Yes |
Gender | Women's |
2X | 3X | XS | S | M | L | XL | |
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Numerical Size | 0-2 | 4-6 | 8-10 | 12-14 | 16-18 | ||
Bust | 42 - 46 | 46 - 49.5 | 30 - 32.25 | 32.5 - 34.5 | 34.5 - 37 | 37 - 39.5 | 39.5 - 42 |
Waist | 36 - 40 | 40 - 44 | 24 - 26 | 26 - 28 | 28 - 30.5 | 30.5 - 33 | 33 - 36 |
Hip | 45 - 48.5 | 48.5 - 52 | 33 - 35.5 | 35.5 - 38 | 38 - 40 | 40 - 42.5 | 42.5 - 45 |
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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[This review was collected as part of a promotion.] I’ve used this full zip mid layer twice now. The first time was an unexpectedly wet and cold hike at Crystal Mountain and it was amazing. I stayed warm, loved that I could pull the sleeves down over my hands and keep them there with the thumb holes (I have raynauds so my hands get cold very easily). We went for nachos after and I was dry so quickly! The second time was last weekend hiking and camping in BC. This time, I was sweating quite a bit and again it performed by wicking away the moisture and keeping me comfortable throughout. Functionally it’s a beast, but it’s also so cute and after 10 steep miles and a lot of sweating, I wasn’t even stinky! Ha Very impressed!
[This review was collected as part of a promotion.] The real test for this jacket was backpacking in shoulder season. Days were warm, but evening in camp the wind picked up and temps dropped. The jacket is warm and fuzzy on the inside but not wind blocking at all. It traps warmth in with the inner ridges. It layered nicely under my puffy and was perfect. Once in my tent the puffy layer was my pillow so I slept in this jacket. It handled my hot flashes and cool downs nicely. After 3 days in it, it had zero smell, and went back on after getting to the car and changing my under layers. I’m usually a L in shirts and this was the perfect fit. (5’6” and 164 Lbs) I have larger muscular arms and shoulders(thanks swimming) and a small ish chest(B cup) It fits nicely without being clingy. The inner fuzz is comfortable against my skin and not at all itchy like some Marino products can be, including on the cuffs and at the neck where they have close skin on fabric contact. It is softer and more cozy after its first 3 washes. Also, as a gram counting backpacker, after a few washes it weighs 319g or 11.3oz.