SRAMs RED shifter optimizes the rider/bike interface. The transition from hood to handlebar is smooth and seamless, and the hood texture provides a comfortable, cushioned grip. DoubleTap technology allows you to up- and down-shift with a single lever, while reducing weight and leaving your brake lever unfettered by shifting. Plus, the shift and brake levers have independent reach adjustment for a customizable fit. And, ZeroLoss technology instantly engages the cable for precise gear changes.