<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->A 5x5 lace closure is a type of hairpiece used in hair extensions. It is made of a piece of lace with hair strands attached to it. The lace is typically 5 inches long and 5 inches wide, hence the name "5x5". The closure is designed to be placed at the crown of the head to create a natural-looking part and provide coverage for the hair extension wefts.