Footwear manufacturers often use closed cell EVA, polyurethane or rubber for cost savings that create an excess of rebound shock to the footbed and lower joints of the body. You wouldn’t want a luxury automobile to have just one type of suspension feature or a high quality mattress that only covers the springs with a single foam covering but that’s exactly what most footwear companies do when it comes to the number one support feature in your shoes. Pro Max insoles absorb an average of 500% more rebound shock from the bottom layer at impact while providing superior comfort and a natural arch support on top. This allows ligaments and muscles in the foot to flexate as nature intended them to do without using hard plastic materials to support the arches.