It's not exactly warm outside in LA, but that didn't stop a handful of stylish women I spotted yesterday from wearing spring's must-have shoe: the slide. Backless, slipper-like and very Olsen-sisters-cool (read: ahead of the curve), this shoe is both easy yet polished. If you're not entirely convinced of them now, just wait till springtime when they'll be everywhere, with designers like Gucci, Alexander Wang, Balenciaga and Acne Studios serving up on-trend variations. A few great options that are currently available come from Robert Clergerie (above), Gianvito Rossi, Dolce Vita, Jenni Kayne, Via Spiga (on sale!), Pierre Hardy, and Gucci.