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.
Great design. Fit is a little tight but not too tight. Very soft, does not make me itch like other baselines have. Already used it hiking a couple times and am eager to try out more of Beyond Clothings' offerings.
As always with Beyond clothing, this is nothing short of perfect quality. My go to company for durable clothing that is beyond comfortable.
Well made, good fit and what I was looking for. I am 5'9" 172lbs. athletic build.... The size large fits well as a next to skin base layer. If you are taller or have broader shoulders, you may want to size up! After washing, per the instructions, the hem sits at the waist and the thumb holes in sleeves are a touch short and pull at the thumb....so it you are planning to tuck the shirt tail, it will either come untucked from movement or from thumb hole use while reaching. Also, the collar will not stand on its own due to the material weight. Would definitely order again!
As a 6'5" tall (ordered large long) fairly lanky body type it's generally difficult to find clothes that fit so I was very happy to find a base layer like this that fit me perfectly. The material has a nice stretch to it so it doesn't feel too confining. If you do have larger arms or a wider torso, you probably want to size up to make sure it's not too tight on your body.
Awesome product! Super comfortable and well made. It was comfortable to wear on its own while active down to mid 30°f.
Need Help? Contact us with any size or fit questions. 206-767-0307
Primus K1 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