Right out of the box, these shoes were garbage. The bottom of the shoe, designed to slide, is not even flat, there were protrusions on the sides, as if something heavy sat on the shoe for a long time, causing it to deform. Both the left and right boots were warped differently, so this may not have been a manufacturing issue. However, the shoes are not comfortable at all. This is a manufacturing issue, they are very cheap and probably wouldn't last a month if they could be used. The Flex-Slip technology looks like it won't slip even if I tried. I won't even try them on the track. They go straight back into the box, will bring them back tomorrow.