Yes, it's possible to order custom orthotics online. The company you order from will send you a mold kit that you can do from home to take a mold of the bottom of your foot, and then they will create the custom orthotics from that mold. However, one of the benefits of getting custom orthotics in-person is that you are working directly with your podiatrist, who can diagnose your specific foot problem. If other factors are causing your heel pain, custom orthotic inserts may not be the best treatment solution.