The Eclipse Cap is the ultimate outdoor sports cap. It's great for all active sports from tennis, running, hiking and golf. It features proprietary 'convertible' crown vents that you can open and close depending on your needs. It's integrated sweatband offers excellent moisture management and moves perspiration to the outside fabric to evaporate quickly. It also features our "clamshell" folding brim which can fold down and will fit in your pocket. At only 2 ounces, the Eclipse Cap offers UPF 50+ sun protection in a VERY small package.