I have a fortrez myself and love it so bought one for my girlfriend.
It has the usual great arcteryx quality and fit.
The best feature is the scuba hood and integrated balaclava that you can pull over your chin and nose. It also puts an extra layer over your ears to keep them snug, ideal on top of a windy mountain. My girlfriend calls it her Ninja top! The fortrez basically works as a hat, scarf and fleece all in one!
I love it!! I wore this hoody whilst scrambling up Tryfan, I took the hardest ascent I could and it certainly stood up to being brushed against rockfaces, kept me warm and i looked good too...perfect. Thanks Guys!