Incase has some great products and a favorite of mine has been the Protective Cover for the iPhone, this is the rubber cover that “should” fit tightly on your phone. It turns out that some of the recent covers are having some issues and began stretching to the point of no longer fitting the iPhone.
According to Incase, this was caused by a bad batch of rubber, the good news is that Incase is standing behind their product and will correct the issue under warranty. If you have purchased a case and are having issues you can head on over to www.GoIncase.com and fill out the return request.
Read [The Apple Blog]