Protect your hair with a lace closure. No leave out needed. A lace closure will give you a natural look. A 4x4 lace closure is a top piece of hair that consists of some hair strands and a relatively small lace base material. 4x4 lace closure suggests the dimension of lace is 4 inches length and 4 inches width, this component of hair were stitched on the lace hand by hand.