Show your feet some love! Taking care of your feet can truly make or break your outdoor experience. Superfeet Flex Insoles are the perfect solution for alleviating stress on the feet, knees and back. Their scientific design hugs your feet and controls the stink to provide all-day comfort. BONUS: Along with saving the ol’ dogs, Superfeet donates 1% of annual sales to those in physical and financial need.With 4mm thick Aerospring™ foam and flexible heel cradle, Superfeet FLEXmax insoles offer long-lasting comfort for most footwear. The Superfeet FLEX series of insoles offer an excellent introduction to the Superfeet experience.