This hat was made with the imitation weasel-wool I got at the wool market in Beijing (search for the thread "name that animal" on the general forum). It is actually 93% imported sheep wool (probably Australian or NZ) and 7% "imitation sable", sable of course being a species of large carnivorous weasel.
Anyway, the product is extremely soft and smooth yarn without too much frizziness. I made this hat for my co-worker Judy (pictured) using the Mielke's Fiber Arts hat pattern I always use and two modifications: I used garter stitch for the "ribbing" instead of vertical ribs, and I added a cute little pom-pom at the top. I'm getting fairly good at estimating my gauge now... this hat is only a little too big.