Here's what other sites are saying:
The performance Penguin Sorbothane UltraCourt insoles are great for absorbing the shock you experience in basketball, tennis, running and walking. Sorbothane cushioning foam absorbs up to 94.7% of impact shock to reduce fatigue, jarring and impact-related injuries. Poron(R) sock liners provide additional shock absorption and cushioning while wicking moisture. Polyester mid layer provides additional comfort and wicking properties. Also effective in boots and everyday shoes-these are for anyone who spends a lot of time on their feet. Both insoles and packaging are PVC-free. Seconds; item has minor cosmetic blemishes that do not affect product performance.