The New Era 9FORTY adjustable hat is a nice mixture of the 39THIRTY and the 9FIFTY styles. This hat is similar in fit to the 39THIRTY flexfit hat with its low profile structured crown and pre-curved visor. But instead of a closed back and a stretch-fit band, this hat has an open adjustable back with a variety of closure types (snapback, strapback, velcro back). Similar to the 9FIFTY, the 9FORTY adjustable hat is not the best fit for larger head sizes, as it can look out of proportion and too small on a large head. If you wear a size 7 5/8, you are borderline in having a good fit in the New Era 9FORTY. If you wear a size 7 3/4 or bigger, the 9FORTY will look too small on your head.