gravity defyer proven pain relief women's g-defy ion comfortable walking shoes for plantar fasciitis, heel pain, knee pain gray, pink gravity defyer don’t let anything slow you down—stay active with the ion shoe. engineered with our lightweight omega sole featuring our hidden versoshock technology. the ion keeps you securely on your feet for fast paced activities while absorbing harmful impact and returning energy to your entire body. the upper is constructed with durable a mesh material for breathability and flexibility. the soft padded collar and tongue shields from skin irritation for long-lasting comfort. note: only the all black ion is slip resistant.