The "Advantage Prone Extra" is like the "Advantage Prone" model described, except that the lower back is made entirely of a sturdy and durable caoutchouc material that keeps its shape especially well.
Advantage Prone Extra
68.7% cotton, 15.1% caoutchouc, 10% cowhide, 0.2% polyester, arm patches: Top Grip (100% caoutchouc)
Choice of leather and canvas from the color chart; rubber in blue or, our recommendation for the back, beige fabric
Standard clothing sizes. Women’s 36-46, men’s 46-60 and 88-102. Made to measure at extra cost.