The Sorbothane Ultra Graphite Arch provides maximum shock-absorption + spring-action arch support + energy return. High-performance insole for runners and walkers seeking extra arch support, comfort and rebound. Helps protect against back and knee pain and foot injuries such as plantar fasciitis.Textured Poron Foam Top Cover: Moisture-management + traction. Keeps feet cool, dry, healthy and in place.Advanced Polyurethane Layer: Cushioning + support + rebound. Less pounding per step.Energy Core Metatarsal Insert: Extra rebound + foot strike protection. Smoother, springier toe-off.Graphite Arch: Spring action arch support + stability + motion control. Properly aligns foot, reduces side to side foot motion and increases heal to toe control.Sorbothane Heel Insert: Up to 94.7% shock-absorption. Positioned at point of impact to reduce pain, jarring, fatigue and risk of injury. Size ChartSizeMen's SizeWomen's SizeA-6 - 7B5 - 67.5 - 8.5C6.5 - 7.59 - 10D8 - 910.5 - 11.5E9.5 - 10.512 - 13