Voted a Top 10 Training Aid by Golf Digest, these glasses are the first and only golf training aid that give instant visual feedback on hidden swing flaws, allowing golfers to align their head, club, and stroke for increased accuracy when putting. The glasses were developed by a team of optical engineers drawing on light collection technology originally used for military night vision. A durable, high-density, shatter-resistant polymer frame converts ambient light into a clear set of grid lines displayed through the lenses. The lines enable golfers to view the best alignment for a putt, improving putting practice and committing proper putting motion to muscle memory for long term accuracy improvement. The glasses work indoors or outdoors and can be used by left or right-handed golfers with equal facility. Comes with a putting guide, a stroke-saver guide, a quick-reference card, and a protective case. (7 oz.)