The original size! Use the small twist-tee knot™ on slim to regular fitting tee shirts and tops. Tip: don't go by the size of the top, rather how the top fits you.
Small Twist-Tee Knot™ Single Pack
The difference between the large and small size is the circle in the middle. The center of the small twist-tee knot™ is slightly smaller than the large. The overall size of both twist-tee knots is the same.