The Speck PixelSkin HD Case for the iPhone 4 & 4S is dubbed HD due to it's high definition grip.
All in Cases & Bags
We've played with waterproof cases in the past and so far they have all worked well. This kind of waterproof case is becoming increasingly popular with the enormous amount of touch screen devices being released.
The Dry Case for Mobile devices is basically an all plastic enclosure. Your device sits in the transparent plastic and the top of the case has a clip mechanism for keeping
The Pong Soft Touch iPhone 4 & 4S Case is made out of soft to touch Lexan. Lexan is the same material NASA has used to make helmets and if you laminate sheets of Lexan together it can with stain a bullet. So the material is pretty strong. It feels comfortable in the hand which is also partly down to the nicely designed case.