Great UNISEX sun hat for big heads and small. A sporty sun hat with a stiff (but not hard) brim that is good in the wind. A good choice for sailing to a peaceful walk in the park. This hat is made of COOL PLUS FIBER, a unique fiber that provides a cool, dry, comfortable feel and does not stick to your skin. UPF Rating: UPF 50+ Brim width: 4" Crown Height: 4" Adjustable Chinstrap? Yes Adjustable exterior headband to size down? Yes Material: 100% Nylon Size: