Primus K1 Long John

$55.00

Available

Color
Black
Manatee Grey
Size

Fit: Standard

-
Size & Fit Guide
Length

This is a clearance item. All sales are final.

Lightweight Next-to-Skin Performance

Build your day on a solid foundation with the K1 - Primus Long John baselayer. Wool balanced with synthetic fibers delivers long-lasting durability, simple wash cycles, and the fast moisture transport your layering system needs. Flat seams ensure bulk-free layering, and a specialized fly provides support and fuss-free access (even with gloves).

Beyond Wool

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.

Package Deal

The Ballhalla™ fly keeps you comfortable all day long with anatomical support and minimal bulk, and the unique design ensures easy access even while wearing gloves.

Fuss-Free Foundation

Flat-seam construction ensures all-day comfort, delivering a smooth next-to-skin feel and reducing bulk when layering up.

K1 - PRIMUS

USE GUIDE

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

SPECS

  • Layer Level
    1
  • Body Material
    2.7 oz. piqué 78% polyester/27% wool
  • Weight (Size L)
    7.1 oz.
  • Wind Resistant
    No
  • Breathable
    Yes
  • Moisture Wicking
    Yes
  • Fast Drying
    Yes
  • Pockets
    None
  • Source
    Imported

Trade Agreements Act Compliant
Designed in Seattle. Imported.

Customer Reviews

Based on 14 reviews
79%
(11)
21%
(3)
0%
(0)
0%
(0)
0%
(0)
J
J.C.
Awesome Undies

I work midnights in Upstate NY, and during the coldest nastiest nights these have kept me warm and comfortable. I never feel too hot or sweaty wearing them. The material and the fit is perfect for wearing under my work pants. They don’t get bunched up, or caught, or ride up like some others do.  Great base layer!

K
K.E.
Simply the best

I cannot truly imagine giving a less than 5 star review for anything from Beyond. These long Johns are, quite simply, the best.

J
J.F.
Best long john from Beyond

I have purchased multiple long johns from Beyond, and these are by far the best. They are a perfect combination with the Rig Light pants for extra warmth. I expect the material blend to last a long time, longer than some other brands where I would wear holes in them pretty quick.

B
B.R.
A great base layer

Had been looking at these for a while and took advantage of the holiday sale. Have already used them winter hiking in the PNW, snowmobiling and skiing as well as wearing out in the weather. They are a really great base layer, providing warmth while not making me feel too hot. A really nice lighter base layer that’s not itchy and you can wear all day.

I
I.
Quality product

Only long johns I've ever had that are actually long enough, love the tall size. High quality as well.

Need Help? Contact us with any size or fit questions. 206-767-0307

Primus K1 Long JohnSizing Information

Height 5' 8" - 6' 2"

Short: -2 Inches Inseam

Long: +2 Inches Inseam

SizeWaistHipInseam Regular
S30-3137-3829
M33-3440-4130
L36-3743-4431
XL39-4046-4732
2XL42-4349-5032
3XL45-4652-5332
4XL48-4955-5632
Measurements in Inches

Waist Preferred Pant Waist

Hip 7" Below Preferred Waist

Inseam Regular Crotch to floor

silhouette diagram

Fit Information

Standard True to Size | Active Layering

silhouette diagram
Product is Standard Fit, developed to accommodate up to two layers, for cross-environmental versatility

Expedition Oversized | Static Layering

silhouette diagram
Product is Expedition Fit, developed to accommodate up to four layers, for extensive use in extreme weather

Learn more about our layering systems

System Builder

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