A ¾” Polyurethane (PU) Border around the sides and back or the full perimeter of the French Lace, Swiss Lace, or Monofilament mens hair systems will allow for more adhesion with glues and tapes, and also allow for easier removal and cleaning.   Some of our clients order a full perimeter PU hair system for active lifestyle activities, such as swimming, running or beach vacations.  Of course, the PU border around sides and back or full perimeter is optional when ordering any one of our Lace or Monofilament custom hair systems for men.