I've owned many wind-breaker-shell like most of us, and this is my favorite. The fabric feels good on the skin unlike most glossy ripstops. This has a matte finish, and has some mechanical(no lycra, all nylon) stretch to it. It's quiter in the wind too .
The hood I was hesitant at first sight. I've not met a "one cord does all" that fit the way I wanted, but this does . The zipper is very easy to use with one hand.
Rain resistence is very very good. Breathability , of course relative to each person, I find very good.
If you're comparing this with the Houdini, well, don't. Ahahaha ! The fit of this is trimmer, and the matte fabric w/mechanical stretch is a huge improvement over the glossy ripstop and well worth the extra dollars.
For fit, I requested this from Acr Teryx, and they answered !
"Thank you for contacting Arc'teryx. Here are the measurements for the Squamish Hoody:"
The chest of the Large I received in Oxblood appears measured by them right at the arm pit, and it tapers from there. I measured 1" below the seam across the chest just below the pocket, and measured 48"/120cm.
I've worn this pretty much year around here in the midwest. I am still completely satisfied with it. I carry it as an emergency rain shell in the summer while cycling and wear it Spring, Winter and Fall cycling , walking and hiking. The hood is fantastic in the winter, I have zero issues with it in any wind, and while cycling. It seals around my face and stays in place. This hood is so much better it fit and fucntion than the Patagonia Houdini, which I've also tried , and so is the fabric. I see they have more color options this year also, hmmm.... sounds like a good reason for another !