Why is it called 13x4 Lace Front Wig? Lace frontal products are often named according to size. 13x4 lace front wig are just that. In the lace portion of the wig, 100% human hair is knotted into the lace holes and sewn into the mechanism wig cap. The 13x4 lace frontal wig measures 13" wide and 4" rear. The hand lace section measures 4 inches from the hairline to the edge of the lace. 13 refers...