A putting aid device for training a golfer in the skill of putting. The putting aid device is formed from transparent flexible plastic having a base with first and second side edges. Length indicia is placed on the first side edge having a first color along a length L1, a second color extending from each end of the first color a length L2, a third color extending from each end of second color a length L3, and a fourth color extending from each end of the third color a length L4. Instructional markings limit the amount of backswing and indicate proposed feet positioning. The device allows instruction for golfers that use a putting arc swing or a straight line putting swing.