Environmental EVA foam free from toxic and odor. They are very easy to maintain and clean. Simply spot clean with a mild detergent towel or leave it out to air dry.High-density and sturdy EVA foam with smooth texture, feels, delicate and dense. It can be kept from deformation even under considerable pressureThe blocks come with beveled edges, 3D stereoscopic cutting technology for comfort as well as a pleasant and soft feel. It can be easily hold even by sweating.