This is my second Bora Bora Booney II Sun Hat...

Great things about the hat: It sheds water very well and the rim is made to float.  It is very light weight and great for the tropics (where I used to live) or the desert (where I live now).  It has an elastic adjustable band so one size fits all.  I have a pretty big head... 7 3/4 or so... and this hat will fit one bigger.  LOL  It crushes and packs well, so it is great for travel or backpacking because it can be stuffed into a pretty small space (like a cargo pocket) and then can be pulled out and used when needed.  I bought one before traveling to live on an island in the Central Pacific and liked it so much that when I lost it in the surf while snorkeling, I promptly ordered a replaced from Amazon.  It also should be noted that it has mesh just above the hat band that extends almost all the way around the hat, so even though you get protection from the sun, you also get to enjoy the cooling effects of air movement.

Caveats:  I might wish that the rim were stiffer because it folds a little too easily if there is wind.  If you are bike riding, sailing, or doing other activity where you expect a lot of air moment, you might find a hat with a stiffer brim more useful.  I do realize, though, that the hat is great for its purpose and a stiffer brim would make it less packable, thus less suited for my needs.  My one other criticism would be the strength of the chin strap and its attachment to the hat itself.  Mine was washed off my head in the mild surf of a tropical lagoon because the strap was ripped away from the hat proper.  Please keep in mind, though, that even though I had a few less than nice things to say, the hat so well suits my life and needs that I bought another the instant that I lost mine.

So... to sum up... great hat, excellent for walking, hiking, backing, travel around the world when weight and size are crucial... not that good for strong winds.  Mine has been with me now to 5 different countries and has visited every hemisphere (North, South, East, and West).