Stance mats are used by all the major league teams and the top college teams. Our stance mats are made of 1/2" extremely durable turf with a 5 mm 90 oz foam backing. The white lines on our stance mat are made of white yarn sewn in as part of the mat. Our Batter's Box Mat, On-Deck Circles (4', 5', and 6'), and Pitcher Mats are all constucted from the same material as the Stance Mats.