Almost any pair of pumps I buy will rub the back of my heels in a painful way. If they are slightly loose, my foot slips in and out of the dress shoe with every time I take a step. If they are snug, then the leather often digs into the back of my heel.
That’s why I love Lifestride slingbacks – they hold your heels very securely on your feet without rubbing them as your foot moves up and down!
Make sure the strap is made of a soft leather. I have come across some pointless slingbacks with straps that are made of an uncomfortable materially that irritates your skin.