Standard table covers are 4-sided and are the preferred cover for use in open areas such as foyers, entry halls, outdoor events and booths, and more. All 4 sides of the standard table cover can be customized with print as well as the top. 3-sided table covers (sometimes referred to as open-back or backless table covers) provide a professional covering for the top, front and sides of the table while leaving the back open for easy access beneath the table. 3-sided table covers work well for trade shows, booths, and areas where the table will be set up in front of a wall. You can print on all sides of the 3-sided table cover including the top.