They pinch!
"Sadly I took the label off too soon when trying these around the house as I didn't notice at first how the EVA part of the sole pinches your heel between the firmer rubber outer sole every time you step and transfer your weight, causing the EVA part to squash down and gape, pinching as it closes again. This happens repeatedly as I walk. Really gutted I didn't go for the Genesis as was thinking about their use when paddleboarding and how they float. Hope this helps you decide which pair to choose. The rest of the fit was fine and even with multiple adjustments to move my heel further forward or backward it still pinched. :( Hope others have a better experience than I have as I am a big fan of barefoot shoes."