How thin is the Power Support Crystal for iPhone 3G? In comparison to Incase Slider?

[Luke1robb]

So I'm deciding between 3 things:

1) Keep my Incase Slider
2) Buy a Power Support Air Jacket
3) Buy a Power Support Crystal Jacket

I'm wondering if anyone knows how thin/thick the Crystal Jacket is.... I know the Air Jacket is .7 mm.

Also, because I have a Slider already, I'm wondering if someone knows if the Crystal Jacket is thinner/thicker than the slider without the clip/belt holster attached.

Finally, does someone know how exactly you put on the Crystal Jacket?

Thanks for the help in advance