Sock it to me

There are socks out there for runners that are specifically designed for the right foot and left foot. They have certain support and the toe area is better.

Do you know the brand of these certain socks or where a runner could purchase a pair? I have seen them before (don't remember where), and I told a friend of mine about them and she wants a pair.

Also what is some advice for a person who has blisters and how can blisters be prevented?

-Lauren