Don't do it!!!
I bought 3 Lifeproof cases when they first came out for my iPhone 4's. I gave one as a gift and kept two and had planned on using them on the two new 4S models. All three cases first shipped had the pillow effect, Newton rings, low volume/muffled sound and speakerphone echo. They shipped me a couple of new fronts with the "sticker" fix. It is just a cheap small rubber seal around the top mic. Both seals were screwed up so the problems remained but the pillow effect was fixed. Called them about the problems, sent those back and they shipped three complete new cases. The one I gave as a gift is now coming back. The recipient doesn't even want to try it based on my past issues, which continue. The word "gift" in German means "poison" and that is exactly what this case is. Both of the two new latest cases I kept still have a pillow effect, which does not go away over time and cannot be "squeezed out." Volume still reduced on both (blowing into the mic port as suggested has no effect other than making you look stupid), and one has Newton rings again, right in the center of the screen.
I have called many times this week and keep getting a recording saying that all agents are busy and to leave a message. You can't. The mailbox is full and the phone disconnects. Altogether I spent 210 bucks plus shipping, and countless hours for what has turned out to be a nightmare of worthless junk. Sure, the thing is waterproof, but it is also userproof. Now I just want a refund and can't even get them on the phone or leave a message. However, I have to give credit where it is due. They are almost as good at marketing as Apple. If only that were true of their design and QC.