To determine which type is best for you, select a shoe that corresponds to the shape of your foot. Runners who need maximum arch support and who overpronate should choose straight or slightly curved shoes. Usually, fast and light runners who need less support prefer curved or semi-curved shoes. If you are still not sure which one you need, make a wet imprint with your feet by standing on a blank sheet of paper or on dry cement. This should help you determine if you have a straight or curved foot.
Companies use different cushioning, ranging from silicone gel to foam.
Ethylene vinyl acetate is the most common midsole foam. It is light and resilient and nearly every running shoe manufacturer uses EVA in at least some of its models. The shoes may feel good on your feet when you try them on in the store, but beware if you overpronate. However, if you do not have this problem, then a flexible, cushioned shoe is what you want. If you still suffer an injury after all the preventive measures, then you need to do what McCurdy did for his tendonitis problem.