Caps - The quality of the underside of your new Lace Front System is just as important if not more important than the hair itself, because it is the foundation the hair is tied to and what actually touches you scalp. It should be comfortable yet durable. The base materials may be wide range if combinations. They can be all lace, lace skin combo or all skin. The skins range from a tissue thin, to a thicker polyurethane. The application or how it's applied will have a lot to do with which type is right for you.">