Skull socks-knee brace sleeve
 

My Asterisk knee brace would always slide down while walking and riding. Very annoying. I have been using the EVS knee brace socks.

I ordered the Skull-Sock knee brace sleeves.
After three solid rides, I have absolutely no issues with the knee braces sliding down. Excellent product.

http://skull-sock.com/

Looks interesting, I had the same problem until I started using the Fly brand sock, it is long enough to fold over the top of my brace thus stopping the "move'