The SleepPro SFA consists of two hard trays, one made specifically to contour the upper arch and one specifically for the lower. Each tray is filled with a custom blended thermoformable polymer. The trays are attached with interchangable straps. Straps of varying lengths are provided to provide a custom personal advancement. When fitted, the interchangeable straps enable precise incremental advancement of the lower jaw. This jaw advancement restores the tension in the upper airway and prevents the soft tissues from collapsing and obstructing the upper airway