Running shoes often have support, mobility, or lightness – few have all three. With that in mind, the creative minds at Nike's "Innovation Kitchen" started from scratch and hit the trifecta with the Flyknit Racer. "The initial pursuit was to build a sock with the durability and strength of a shoe," says Nike designer Benjamin Shaffer. Crafted from a highly technical knitting process, the shoe is breathable and form-fitting. And since it's made from a single woven layer, instead of several stitched or fused together, it's incredibly light – just 5.6 ounces. [$150;]