The Arc Glider is a small, plastic device that is attached to the face of the putter and allows the golfer to feel what the putter feels like when the putter-face stays square to the arc.
This is a great training aid for teaching the putting stroke to beginning golfers of all ages. They get an immediate feel for correct club-face alignment during the putting stroke.
When we first introduced the Arc Glider, Jason Dufner gave it a good test and a great testimonial while he was still on the Web.com Tour, and before he became a major champion.
This is also a great teaching tool for the accomplished golfer who has a hard time of getting the feel of a putter face that is square to this/her arc, or does not want to look at the putter-face during the putting stroke.