The traditional, sometimes referred to as classic or standard cap, is a wefted construction where synthetic hair is machine or hand sewn into strips of material. A "weft" is the narrow strip of material that has hair, all going in the same direction, sewn into it. These strips are inter-connected in horizontal planes going back and forth over the entire cap. This provides overlapping layers of hair and simulates natural hair growth. With a standard wefted cap you are buying a wig whose style cannot be altered.