The hardness of EVA materials is usually between 40 and 70 degrees. The bigger the foaming is, the less EVA material is needed for the same volume, and the cheaper the price is. The higher the hardness of EVA, the more expensive it is, which is a common sense problem that everyone needs to pay attention to. EVA is an ethylene-vinyl acetate copolymer material, which is a non-toxic, tasteless and transparent thermoplastic.