I found the thinnest case for the iPhone 4, the Slice 3 by Pinlo 0.350 mm of polycarbonate to be exact. Comes in many translucent colors too. I have the GSM(ATT) version. The Verizon has a different cut/back design that I don't care for. I have the NGP Incipio (smoke gray great protection), the Bumper(Apple), and the Acase Superleggero Diablo. I also go naked with just a Sena pouch. So, I understand the need for protection, but mostly I don't drop my phones. I just want something that Apple neglected to give me (and always does): a better grip on the back/side, and a bit of cushion so I don't feel that the back of the phone will sit in table crumbs. - sure the glass won't scratch so easily, but a bit of 'skin' is all that I want. The Slice fixes antennagate too. Plus it DOES fit into apple's slimmest iPhone 4 docks: it is that thin. I like the Acase, because it is thin, and has a nice feel. The Acase is 0.7mm thick. And in this world of 'black' cases, I like to show the Apple logo through the case. The Acase Ice Cube fit the bill, but I really wanted something 'smoke' like the NGP Incipio, Mercury translucent. This Slice 3 does that. I almost canceled my order...thinking it too thin. But I like it. Crisp Apple logo shows through. No bulk added to the phone. And I know it is only a skin...not drop proof...but that is want fits my needs. I do switch out when necessary. The jury is still out on how often I can remove this case without breaking... and I will update. Pinlo give instructions on the best way to remove carefully. I polycarbonate and thin enough to bend, but care must be taken. Feels good in the hand. So thin, even the back iPhone lip is evident. $26.