Designed to prevent spitting and discourage biting by prisoners in custody. It�s easy to use and stays in place with a secure-lock One size fits all. Disposable. Features Include:- Easy application - no straps or fasteners - no front or back- Allows for easy visual monitoring- Medical filtration fabric to contain contaminants- Wearer can maintain proper vision in all directions- Extremely difficult for wearer to remove ALL SALES FINAL...NO RETURNS