The Men's Endurus XCR Boa Trail Running Shoe is the lightest, most custom-fit trail running shoe in The North Face line. A pair of Men's Endurus XCR's (size nine) weighs less than two pounds! The ridiculously light weight of the Endurus and the comfort of a trail running shoe make you feel like you're running barefoot. Armed with waterproof breathable Gore-Tex XCR, your feet will stay dry on sopping wet trails. The North Face has virtually eliminated pressure points in the Endurus thanks to their use of the Boa Lacing System. The Boa Lacing System operates like a suspension system allowing you to dial in an even, repeatable tightness that won't come loose and never needs retying.