WHAT IS A HD LACE CLOSURE? HD lace is a royal lace material that used to be called Swiss lace, and which is invisible when applied to the scalp. This ensures that the wig-wearer can have an exposed hairline, which looks very natural and renders the lace along the hairline highly undetectable. The quality of your HD Lace Closure is extremely important. Be sure to invest in a top-quality lace closure for the best results.