Originally Posted by
deep_sky
Well, for me, my foot would slide forward into the too-big toebox, then slide backwards on the back-end of the stroke into the too-big heel cup.

I do need arch support as well, as I expect most people need at least some support.
It just sounds like the OP is strangling his feet because he thinks that it's necessary to keep the shoes on securely.
My straps and buckles are loose on the Genius 5, ergo 1, genius 6.6... I was only describing how loose the Genius 5 Megas were...