Lightweight Next-to-Skin Performance
Build your day on a solid foundation with the Primus K1 Pullover baselayer. Wool balanced with synthetic fibers delivers long-lasting durability, easy wash cycles, and the fast moisture transport your layering system needs. Flat seams ensure bulk-free layering, and thumbhole cuffs combine with a ½-zip front to offer adjustable warmth.
Our wool combines with synthetic fibers to create the ideal performance fusion for moisture management: wicking up and lifting out sweat, protecting against odors and wash shrinkage, increasing durability, and ensuring next-to-skin comfort. Your system’s moisture transport starts here.
Flat-seam construction ensures all-day comfort, delivering a smooth next-to-skin feel and reducing bulk when layering up.
Thumbhole cuffs extend coverage for warmer hands, and a 1/2 zip front helps shed extra heat in a hurry.
K1 - PRIMUS
WHEN TO USE
Below 50° F as a next-to-skin baselayer.
PAIRS GREAT WITH
Active insulation and softshells.
BENEFIT OVER OTHER LAYERS
Highly breathable, fast-drying layer that can have any other layer worn over it.
Learn more about layering:VIEW SYSTEM BUILDER
Body Material2.7 oz. piqué 78% polyester/27% wool
Weight (Size L)8.5 oz.
Trade Agreements Act Compliant
Designed in Seattle. Imported.
The fabric on these shirts is soft but tough for a shirt, resistant to snagging (both on branches and the inside of your jacket sleeves) and pilling. One of the warmest base layer shirts I've used and breathes better than most too. Wicking is good.
Fit is fantastic for me. It's difficult to find shirts cut with enough of a taper to cover a 10"+ drop and this is well fitted. Which is good, if your base layer is baggy you're gonna have problems with excess fabric stacking by the time you get to your shell.
Front zipper is a good length. The only thing I would really change is to make the front of the bottom hem a 1/2"-1" longer. The back of the hem has a slightly extended length (which is good so it doesn't ride up when you bend over) but the front has a slightly shortened length (about even on me with a same size hanes v neck) and tends to ride up a little when reaching over your head.
Small nitpick, and I wouldn't extend it as far as being even with the back hem. and doesn't really affect anything when you're layered up. But if I had to make a change, that would be it.
Great shirt but runs quite small and it very short in the torso.
Although I only had this for a short amount of time, I did put it to good use when it dropped down to 15F last week. It does a good job keeping me warm and it did an excellent job keeping me dry when working out. It feels similar to %100 merino wool thermals but half the cost. My only complaint is it does run a little short. I wish it was a little bit longer to prevent the shirt from pulling up when bending over or hanging from a pole.
Recently ordered two of the K1 pullovers to start preparing for a snowboarding trip in January. I haven’t lived in a climate that requires winter clothing for some time so I was starting from scratch but knew about what I wanted from past experiences living/working in the cold. I was impressed enough with the K1 pullovers that I ordered K1 pants and a K2 pullover to go with them. The material feels great, not scratchy or otherwise weird feeling at all and seems plenty durable. Little features like the quarter zip and thumb hole sleeves just seal the deal with these, I’m very impressed with them especially coming in at this price point.
The half zip pull over is a bit form fitting with goof reason that being said ...its also nice enough to be worn as an outer layer on mild to moderate nights or days ...but if ya husky like me and dont want it so form fitting order a size up
Need Help? Contact us with any size or fit questions. 206-767-0307
Primus L1 Pullover
Height 5' 8" - 6' 2"
Short: -2 Inches in Sleeve and Torso
Long: +2 Inches in Sleeve and Torso
Chest Widest part of chest
Sleeve Center back of neck to shoulder seam to sleeve hem edge
Standard True to Size | Active Layering
Expedition Oversized | Static Layering