A double V-ribbed belt having a body with an inside, an outside, a length, and laterally spaced sides. At least a first rib is exposed on the inside of the body and extends in a lengthwise direction. At least a second rib is exposed on the outside of the body and extends in a lengthwise direction. A substantially inextensible layer resides between the first and second ribs. Laterally extending reinforcing fibers are provided in the body on at least one of the inside and outside of the inextensible layer, with the concentration of reinforcing fibers on the inside of the inextensible layer being different than the concentration of reinforcing fibers on the outside of the inextensible layer.