Penguin UltraRun(TM) insoles transform your feet into shock-absorbing, energy-returning, go-all-day machines. Viscous elastic polymer heels and metatarsal inserts absorb up to 94.7% impact shock. Polyurethane foam throughout provides structural support and added cushioning. Poron(R) sock liners provide additional shock absorption and cushioning; non-slip topsheets provide antifungal and moisture-wicking protection. Both insoles and packaging are PVC-free. Closeout. |