Hi Guys, I know this is a bit of a silly question but I've never owned a pair of slingbacks before up until 3 months ago or so. I've been on vactation in Hong Kong for about a month and it wasn't the best place to bring my slingbacks there to wear. But now I'm back and have recently started wearing them around, but the back keeps slipping off my feet every few steps. I've tried to adjust the rubber band to cling to my heel and nothings working!! Does anyone have any good tips for me? TIA!