1. A DRIVE BELT COMPRISING THE COMBINATION OF A CURED ELASTOMERIC MATERIAL AND A PLURALITY OF ADJACENT ROWS OF GLASS FIBER BUNDLES EACH OF WHICH IS FORMED OF A PLURALITY OF GLASS FIBERS CHARACTERIZED BY HIGH STRENGTH AND DIMENSIONAL ABILITY UNDER THE TEMPERATURE AND PRESSURE CONDITIONS OF USE AND WHEREIN A STRONG TIE-IN EXISTS BETWEEN THE FIBERS AND THE CURED ELASTOMERIC MATERIAL, SAID FIBERS BEING CONFINED WITHIN THE ELASTOMERIC MATERIAL AND ARRANGED THEREIN TO EXTEND SUBSTANTIALLY UNIDIRECTIONALLY CROSSWISE OF THE BELT AND IN WHICH THE BUNDLES OF GLASS FIBERS ARE CONCENTRATED IN THE INNER RADIAL PORTION OF THE BELT.