Case-Mate, the company behind Tank, is touting how protective the new "military-grade" case is, and thanks to a partnership with the folks behind SharkEye cases, it has a unique, retractable window that covers the screen but also gives you full access to the screen when needed.
The Tank comes in a few different colors, including the color you see pictured, as well as a simple black and white with pink trim. It's got a nice textured finish, and while it's somewhat bulky, it is lightweight. A belt clip is also included and protects the screen further.
This is a universal case that fits both the iPhone 4 and 4S. While it's not waterproof, it does offer some protection from rain and sand. You can drop it from 4 feet, but don't drop it in the toilet.