It has polycarbonate plastic to protect the back, sides, and front perimeter. The screen is kept dust and scratch free with a replaceable polycarbonate screen protector. This is a separate piece and can be bought if something happens to yours. It is glued to a rim piece and is not one of those stick-on screen protectors (which I can never get to work right), a great design!
The heavy duty silicone outer is the major defense against bumps and bruises while traveling and usage. I personally use my iPad2 a lot in the garage and there is nothing soft in that environment, that’s why I chose the military edition.