Sarah, my suggestion is that you try these pants in person unless you can get free shipping. I bought a pair of perfect trouser pants made with the same fabric. I absolutely abhor the fabric on this entire line of GAP pants. It is some sort of blend of all synthetic fibers, that stretches out beyond recognition.
I generally don't like polyester and suffocate in this kind of fabric blend. I am not sure why I bought these pants in the first place
EDIT: I just rechecked the fabric content listed per your link and it seems that it's a different blend - I am not sure thought, I remember seeing these in the store and it is the same fabric of my pants. Other than the fabric issue ( if there is an issue), they look great!