Zagg has released a new Invisible Shield for the iPhone 4 that works specifically with the Incase Slider and Apple Bumper. The problem with the original IS was that it would bubble up/pull up when applying the bumper or Incase Slider. The new Zagg shield that Best Buy has is made specifically for people with tight fitting cases. The new shields are smaller and do not extend all the way to the edge on the front of the iphone. It leaves just enough room for the slider edges to go on. I haven't seen this on their website, and found it accidentally at BestBuy. I have it installed and it works great. They only offer this for the front shield as of now.