This single-layered material is usually made of EVA, polyurethane or rubber designed more for cost savings but it also creates an excess of rebound shock that transfers through to 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 comfort feature in your shoes. Pro Max insoles absorb shock from the bottom layer at impact while giving your feet a soft rebound from the top layers.