Right after my wife got her MacBook a few years ago we purchased a Marware wrist protector so that her white wrist rest would not get dirty and become stained like others I had seen. A few months ago she had to get the entire plastic top piece replaced and lost the Marware in the process. I did some research trying to find a better product. I remembered that the Marware was very difficult to apply and didn't fit just right because the material was a little bit stretchy, etc. So I found an article that had reviewed a few websites who made skins for different devices.
Ultimately we ended up going with istyles.com and I do not regret it one bit! The skin was easy to apply, no air bubble problems, it looked really nice, appeared durable, and both the clamshell and wrist protection skins cost about $36 including shipping...