Take a big step towards happy feet! Thin insoles that won't make your shoes tight!! They go after the real cause of plantar fasciitis, heel pain, bunion discomfort, shin splints, neuromas, tendonitis, and more. Forget cushiony gimmicks - Ninjas provide the solid, springy support that tackles pain at its core. Created from incredibly springy polypropylene plastic for unmatched comfort and longevity. Never smelly, never soggy.