Not saying which is the most important, but what one thing do you say "man I like this" every time you put it on? For me it's knee brace socks, I have a pair of Fox Racings product and I love them. Keeps the knee braces (and even knee guards!) from rubbing against your skin and the socks stay put. Leatt also has a pair and I'm sure there are others. If you wear knee braces and don't already have a pair, I'd highly recommend them.