The invention relates to composite materials and a fabric for use in the composite materials. The fabric has an enhancement system made of reinforcing warp yarns and reinforcing weft yarns, wherein the reinforcing warps and the reinforcing wefts are arranged on the top of each other in two different reinforcing layers and are not connected, and can be referred to as a representative core. The reinforcing threads are formed of reinforcing yarns. A connection system for connecting the warp yarns and the connection weft yarns is formed by connecting yarns, and the connecting yarns have a yarn number smaller than the number of yarns of the reinforcing yarns. The fabric is only connected in the connecting system. The reinforcement system is surrounded by a connection warp on one side and a connection weft on the other side, and therefore the position is kept in place. The connecting points are arranged in the connecting system. At each connection point, the connecting warp is guided and held between a static warp yarn of the warp pair of the warp yarn and a common warp yarn. Between two adjacent connection points of the warp pair, the static warp yarns and the common warp yarns have atleast one intersection point.