BioSync flexible hipbelt and shoulder harness that stretch and move with the natural motions of your body. Adjustable torso length that is connected edge to edge to balance the load and provide 3.5" / 9 cm of adjustment. Channeled foam backpanel featuring aerodynamic grooves to promote air movement and keep your back cooler. Perforated, padded shoulder harnesses with flexible edge construction for dynamic, breathable comfort. Large zippered hipbelt pockets large enough to carry your phone and trail essentials. Independent zippered pocket with SpeedClip hydration hanger, compatible with Gregory's Hydro Reservoirs (reservoir not included).