I am so glad to have found these hats.
Best features:
Lightweight and cool
360 degree coverage - protects almost all of face (all but chin really), ears and neck
Holds up to occasional machine washing (I don't put it in the dryer)
Stays on even in wind
Adjustable for a good fit
Comfortable - kids don't complain about wearing this!
The only downside of these hats is that I would not consider them stylish in appearance - but I don't really care how my kids look if they are having fun and not getting sunburned.  I find I can use less sunscreen on my children's faces when they wear these - and they hate sunscreen so that is a huge plus.  These hats are expensive but worth every penny.