Montrail has somehow figured out how to combine light weight and extreme "airy-ness" (wonderfully breathable) with incredible support! I normally have to buy expensive insoles to support somewhat weak ankles and bad knees (one has been replaced), but these shoes are perfect just as they are. I bought a pair on recommendation at a sports store, then loved them so much I bought another pair here in case I can't find them again or mess up a pair. If you want superb support for trail running (personally, I do lots of light to moderate mountain hiking), especially for the summer when hot feet just won't cut it, these are definitely for you.
Hoping they keep making this great shoe,