The Solinco Outlast is a co-polyester string that offers a softer stringbed than traditional polyesters. We found the string to provide great bite on the ball, imparting tons of spin on our shots. Great on its own or as part of a hybrid, this string is perfect for the big all court player. Utilizes an innovative , high powered polyester monofilament fiber designed and shaped to provide exceptional durability and unparalleled playability.