4x4 lace closure is exactly as its name suggests, a closure that is made from lace with a 4 inches wide by 4 inches deep size. The lace size of the 4x4 lace closure wig is smaller than the lace size of other wigs, the benefit of smaller size closures is you have more control over the part when styling the hair, and the 4x4 lace closure wig is also cheaper than other wigs.