The Sea to Summit Kimberly Hat is a waterproof & breathable Gore-Tex bucket shaped hat. With its' tape sealed 2 layer construction, your head won't be getting wet by the rain or snow any time soon! The foam located in the brim allows the Kimberly to float on water in case it falls in. Compared to the Sea to Summit Java Hat, the Kimberly Hat is wider in the brim area. Need to stuff your hat in your luggage? No problem, the Kimberly Hat is not poorly affected by stuffing and squashing! The removable chin strap gives you the capability to put it around your chin in higher activity events, or leave it off for lounging around town. The Sea to Summit Gore-Tex Kimberly Hat is a great companion for any kind of condition!