Viberg's N1 boot is based off the WWII-era boondocker boot that was issued to the Marine Corp. The leather is Marine Field from Horween, the same tannery that was used for the original N1s. The roughout side is used throughout the upper, while the tongue features the smooth side of the leather. The sole is Dr. Sole's Cord Sole, which is inspired by vintage WWII field boots and contains pulverized hemp cord within for a textured look and a better grip.