For my money, Bob is making the most interesting hats in the custom market today. Kudos to the hatter and the inspired collaboration. :eusa_clap
"this felt is a melange of different colored wool or fur fibers (you can't see it on the picture). Mostly they were mixed with some synthetic fibers for special effects ...
It was popular in Germany in the sixties and seventies for sporty, casual hats. The finish looks like "rauhhaar" or "stichelhaar" (different word for the same meaning)."