Insoles for high arches should not support the arch directly. Opposite to ‘flat feet’, high arched feet that struggle to flatten under load (under pronate). Cavus feet (pes cavus) are often less mobile than other feet and offer a reduced weight-bearing surface that makes them more prone to forefoot callus and ankle and arch discomforts. They tend to benefit from the use of cushioning and heel-lifting insoles. For more on how the foot arch works and why cavus feet can be a problem, click here.