There are under arm zips for ventilation, but otherwise a pretty sealed shell. The nylon ripstop fabric is nice and light, but the actual level of breathability leaves me wanting more.
Absolutely worked like a charm. Stopped all of the rain and weather that was thrown at it. I took of the jacket and with a quick shake, flicked all of the excess water off. According to Evo Waterproof ratings, I would say it's between 16,000mm - 20,000mm. I couldn't imagine it as 20,000mm+ based upon the nature and quality of the fabric, but I haven't had extreme enough weather to test it.
I'm really lazy when it comes to returning clothes for the correct size. I'm impatient. But, even though this jacket runs large, I decided that it would be good for layering once it starts to get colder. As a shell for warm weather, it's a bit bulky. The cut is a little too feminine for me (I hate when the bottom flares out) and the picture on the website is a bit misleading. Just show me a front view of the jacket!
Super cheap closeout price on REI. $49 dollars plus a pair of socks to earn free shipping, can't beat it. I would never drop $80 bucks on this.
Overall opinion, the jacket was cheap enough to let it's lack of breathability slide. It's kept me perfectly dry and is super lightweight. I see myself wearing this a lot for hiking and as a rain jacket. I'm not super excited about the fit, but it will work out and be handy in the Fall/Winter. I would recommend to everyone to spend the ~$50 or so and pick up a waterproof shell for cycling, it makes the morning commute a lot more tolerable.
Stay dry and have a great Monday! Oh and there's a men's version of the jacket too.