hi,
imo both are the same material (what's the point of selling two products if there's one efficient and the other one prettier but totally useless?)

btw, I just checked, it's in the features : Features

* Scratch-proof patented film
* 45 Day Money Back Guarantee
* No added bulk
* Military Grade
* Improves Grip
* invisibleSHIELD™ Protection ,invisibleSHIELD
* Easy to remove, leaving no sticky residue
* 0.3 mm thick

anyway, good news it's finally available for n900 (the skins, not the shield)