Our line of Quantum Saddles are built on our flexible Ultra-Flex Saddle tree, made out of high quality Carbon Fiber. The advantage of our Ultra-flex tree is, that although they are slightly flexible, they will not collapse underneath a rider's weight, while allowing the horse to move out freely. A great benefit of the Ultra-Flex tree is that it's also very light weight and most riders enjoy this benefit greatly. We take great pride in bringing you one of the best and most reliable flexible trees available on today's market.