So this is the third Outdoor Research hat we have bought.  So far it is 2 rain-hats and this guy.  I love the Sombriolet.  The brim is wide enough to keep the sun off (102 degrees last Saturday!), yet the hat is very light and comfortable.  The vent seems small and I wondered if it would do any good, but it works very well.  All in all, I am extremely pleased with this hat.