Each shoe features a patented Gravity Defyer sole made of specially engineered polymers to absorb shock, while industrial grade Memory Springs™ propel you forward, making every step light and pain free. They keep your feet dry and "sticky free" with our AVS³ Cooling System™, while wide toe boxes and our patented Perfect-Fit™ width sizing system (on select styles) gives you the room you need for ultimate comfort. The interior of every shoe is lushly padded with our removable Comfort-Fit™ insole and accommodates most orthotics, guaranteeing flexibility and a perfect fit for any foot.