With an upper fabric that consists entirely of theEngineered Knit Technology, the Momentum provides stretch where you need it, support where it matters and all-around exceptional breathability. Black Diamondalso added a micro-fiber liner to the front of the shoe to minimize stretch and maximize comfort. The Momentum's durable rubber is unique in that it's molded- inspired by the way Black Diamondforges theircarabiners-versus cut from one sheet of rubber. This is an engineered solution to optimize the shoe's rubber and rands for weight, consistency and comfort. Built for all-day comfort on moderate routes, boulders, or gym sessions, the Momentum features a soft flex midsole for sensitivity and is the perfect entry-level climbing shoe.