Increased arch support helps many foot problems, but the amount needed is subjective. Generally, flat feet need more rigid insoles, and high arches need more flexible insoles. But how much you need is an individual choice and may depend upon other factors. Don’t be afraid to order firm insoles, which will need time to be broken in. But after a reasonable period, if they still hurt your feet, ditch them. You ordered insoles to relieve pain, not to cause it. Insoles that are poorly matched for your feet can lead to additional foot, ankle, and joint problems.