So, most people will say big and rubber. But, I bought a lucky one a f staples for my iPhone4S that I drop almost EVERY day. Not a crack on the screen and almost no scratches on the case. It is hard and medium in thnckness. So, back to the point, I would recommend a hard, plastic one. Make sure when you put it down on a flat surface, the sides are touching the surface, not the screen--this will help to protect your screen.