As a career ankle sprainer, I use these for both ankles.

http://bledsoebrace.com/products/ultankle.asp


They are awesome. You can't even tell you are wearing them and they allow full motion, including running, etc. Since getting them two years ago, I have not sprained my ankle. Sprains used to be a daily event for me. The braces are kind of pricey, but worth every penny to me.

For kneepads, I picked up a moderately priced pair at our local home improvement store. They work great too.