Orthotics are are prescription medical devices that you wear inside your shoes to correct biomechanical foot issues such as problems with how you walk, stand, or run. They can also help with foot pain caused by medical conditions such as diabetes, plantar fasciitis, bursitis, and arthritis. Orthotics might even help you avoid surgery to fix flat feet.
Types of Orthotics
Rigid orthotics, or “functional orthotics,” are made from materials like plastic or carbon fiber. They’re best for walking shoes or dress shoes with closed toes and low heels. This kind of orthotic is designed to ease foot aches and strains as well as pain in the legs, thighs, and lower back that you might feel if your foot doesn’t work like it should.
Soft orthotics, or “accommodative orthotics,” are made from soft compression materials. They provide cushioning to take the pressure off uncomfortable or sore spots from conditions such as plantar fasciitis or diabetic foot ulcers. Because of their bulk, you might need to wear soft orthotics with prescription footwear.
Source: https://www.mayoclinic.org/diseases-conditions/osteomyelitis/symptoms-causes/syc-20375913