As a physical therapist, I choose insoles based on a patient's foot type and specific issues. Proper arch support is key to correcting alignment and reducing pain. For high arches, I recommend firm arch support to prevent the arch from collapsing. For flat feet, cushioned arch support lifts and stabilizes the arch. Neutral feet need moderate arch support. I once treated a runner with plantar fasciitis and overpronation (flat feet). Custom orthotics with deep heel cups and arch support reduced his pain by providing stability. After 6 weeks of therapy and orthotic use, he was back to running 5 miles without pain. Arch support is important because it helps align your body by supporting its foundation—your feet. Poor alignment leads to pain, injuries and long term joint issues. The right insole can help prevent and relieve many foot, leg and back problems. In my experience, custom orthotics provide the best results since they are custom to your unique foot. But high quality over-the-counter insoles can also work well, especially if cost is a concern. The most important thing is finding what's right for your specific foot type and needs.
Finding the perfect insert starts by examining the needs of the consumer's foot type, such as high arches, flat feet, or a neutral arch. The reason great fit and proper arch support are so important is exactly because they are going to help align your body and therefore prevent unnecessary strain from being put on your feet. Ill-fitting insoles are only likely to bring about discomfort and further deterioration of conditions from which the user may already be suffering. Insoles may be custom or specialized to fit your foot structure properly and provide maximum support, comfort, and overall foot health.