The iSkin Solo case for the iPhone 4 is a straight forward simple yet good looking TPU case. The Solo is one of the better TPU (Thermoplastic) on the market, it doesn't feel like a cheap case and it's very well designed. The back of the Solo has a shiny glossy finish which shows fingerprints and a bit of lint if you pick a dark color. After using the Solo for a while I found that it can get scratched easily but it isn't all that noticeable.