This summer, the slide-on sandal is replacing the ubiquitous flip-flop as the casual footwear choice of the chic set. This riff on the old-school Birkenstock has been re-introduced by designers from Isabel Marant to Derek Lam to Marni and many more. Make sure to grab a pair and wear them with everything from boyfriend jeans to flirty mini-skirts. We’ve found you five pairs for under $100 and five pairs for over $100. You’re welcome.