A-class EVA is environmental protection material (new material foaming).

B class EVA is half environmental material (half new material and half recycled material).

C-class EVA is ordinary material (recycled material).

EVA mainly looked at the stomata distribution and hardness on the surface.

There are few holes on the surface of a-class EVA (basically none).

There will be some holes in the surface of b-class EVA.

There are many holes on the surface of c-class EVA.