two weft threads 4 fig1 respectively the central fabric layer 20 receiving the tensile forces has two warp threads 21 22 that are displaced or staggered relative to one another and cross two weft threads 4 respectively the lower fabric layer 30 is comprised of four warp threads 31 32 33 34 that are displaced or staggered relative to one another and cross inwardly toward the central fabric layer 20 only a single weft thread 4 and outwardly at least three weft threads 4 the three fabric layers 10 20 30 are interwoven with one another by means of binding threads 40 41 42 43 the binding threads are divided into two thread groups the binding fibers 42 43 form a first thread group and are displaced relative to one another they connect the upper fabric layer 10 and the central fabric layer 20 to one another the binding threads 42 43 are alternatingly guided across one warp thread 4 in the upper fabric layer 10 and one warp thread 4 in the lower fabric layer 20 similarly a second thread group is formed of the binding threads 40 and 41 and the threads 40 41 connect the lower fabric layer 32 and the central fabric layer 20 as illustrated in fig4 in connection with fig1 to 3 in the illustrated embodiment at least one warp thread 14 u2032 extending in the longitudinal direction 5 of the belt 1 is provided in the upper fabric layer 10 of the belt 1 the thread 14 u2032 is comprised of a cavity forming thread material i e a thread material that is different from the warp threads 11 12 13 and 14 provided across the remaining portion of the upper fabric layer.