What is A7 Bar Grip? A7 Bar Grip is a one-of-a-kind performance shirt with a patented silicone grip on the back that is designed to help with slippery commercial benches and bars. The grip helps you stick to the bench during bench press and anchors the barbell to your back when squatting. Bar Grip is the ultimate training shirt for powerlifting, strongman and weightlifting workouts.