With glare-blocking polarized C3™ lenses and a rounded FloatFit™ frame that weighs less than an ounce, the Oslo may look like a regular ol’ pair of sunglasses, but they’re quietly engineered to go hard. Custom spring hinges and three sizes of GEKO™ non-slip nose pads dial in your fit so the frame stays put while running after the kids, running late for a meeting, or running a marathon.