They are so cute! They are one size fits all, and when I got them, the packaging said size 6-9. They fit me fine, but I wish they were size 5-9, since I'm normally a size 6 and like my socks to be a little tighter. But it's not a big issue, I also noticed that they don't come up as high as the Ultimate Running Sock or the Featherweight Sock, so yay!
They feel pretty similar to my Featherweight socks so I think they are made of the same material. The best part about these is of course, the non-slip sole.
I'm going to my bare class next week so I will have to try them out then. But from the self-test I did on my hardwood floor, they worked pretty well and I was not going anywhere! Even walking around normally I could feel, and hear, the stickiness. So excited! I noticed that these socks are already sold out online, so if they turn out to be great, I hope I can find another pair somewhere! Oh, maybe Lululemon will make new colors in these too!