Primus L1 Long John

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Primus L1 Long John

Primus L1 Long John

Regular price $21.49 USD
Regular price $55.00 USD Sale price $21.49 USD
ColorBlack Manatee Grey
Availability: Only 0 Left!

Not Eligible for ID.Me or Additional Discounts

Trade Agreements Act Compliant
Designed in Seattle. Imported.

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Primus L1 Long John
Regular price $21.49 USD
Regular price $55.00 USD Sale price $21.49 USD
The Primus L1 Long John baselayer provides a powerful foundation for the rest of your system. A carefully balanced blend of wool and synthetic fibers ensures long-lasting durability, simple wash cycles, and fast, efficient moisture transport. Flat seams allow bulk-free layering, and a specialized fly delivers support and fuss-free access (even with gloves).


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.


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.


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

Customer Reviews

Based on 47 reviews
Awesome Longjohns!

These are super comfortable and fit perfectly. They have a really nice feel also.

Great clothes

I am very impressed with my clothes. Good prices, fast shipping and made in the USA.

Great base layer

These are very comfortable!

Kyle R
Comfortable Underlayer for all around use

I have worn these twice so far- once under a pair of prana lightweight pants and once under jeans. Both times the Primus kept me nice and warm. I was not hot or feeling over-dressed. The fit was good. Ordered a size L, I usually wear a 34 x 32 jean and these were just a touch big and long. Nothing to complain about, just insight into sizing. These were as comfortable, if not more, compared to my REI brand 100% wool long johns. These Primus pants didn't seem as delicate as the wool pants- but only time will tell. The thicker waist band is appreciated.

Travis Sanders
Almost perfect

I was looking for something to warm me up on 34* mornings but not be too hot for the rest of the day. These work great! I’m 5’10 and 195 lbs, slightly dad bod and the mediums are a great fit. The only thing is the crotch is super long and somewhat baggy (make your jokes) which made the flap pretty sloppy and would open up on me. Otherwise, pretty good.