This shoe fits true to size - more like a typical running shoe than a hiking boot (which is appropriate). Having said that, I ordered up .5 of a size (11 instead of my normal 10.5) because that's all that was in stock. The toe box is definitely roomy, the rest of the shoe fits more like a 10.75 than an 11. So to be fair, I guess it does run a little small, so if you want to wear a nice pair of thick wool socks, liners, etc. I would go up half a size. The shoe is average to light in weight, it has a fairly stiff mid-sole so it's great on the trail, but of course not on the pavement. There are no hot spots, and (flexibility where it needs to be) is great. Not too familiar with the Hyvent in a shoe, but with moderate testing I'd say it's waterproof and breathes as well as a waterproof shoe can. The blue color is an added bonus. One thing that bothers me is how short the tongue is. It must be designed for better dorsiflexion without having the tongue rub there on the anterior ankle ... I'm always afraid it's going to slip down, and the knot where I tie my shoe will rub on my sock. However, this has never happened. So although it sits low and looks funny to me, it functions just fine.