If I can find the samples of Horweens Zug, I'll post them here. Otherwise EG Paris has additional samples. Three colors were offered: black / oxblood / dark brown. I think ~2mm thickness.
Zug was the town in Switzerland where the leather was created and now, Zug is just the stamped pattern grain name btw originally known as "Martin's Grain" (no clue who Martin is/was).
There is some interesting history on the forum about the original leather (pg 427 on this thread)......aforementioned was from my memory.
Regardless of leather producer, should still make for a cool boot.