Thank you, Oak for the research... all I know is that after I started getting my shoes at the LRS, I had no more burning and squeezing every time I was at the gym... I replace my shoes once a year to 15 months, despite the fact that I am not really "running" in them. A few pairs managed to live through my 2-3 attempts at running, but unless my SI joint miraculously repairs itself totally, it's not in the cards. I still get the urge, but it hurts when I try, so I don't have a choice.