This pattern should fit a typical male head of 24” circumference. The rib pattern is stretchy. It will fit smaller and wider size heads. You could decrease/increase the number of stitches cast on in multiples of 10 and still follow the pattern. If you want more length to your hat increase the number of rounds you do.

Yarn: Monkey Jewels sock, 100% merino superwash, 1 skein (with about a half of a skein leftover), color Sleek - a beautiful charcoal grey
Needles: US size 4 (3.5mm) sixteen-inch circulars
Pattern: My own, see below
Design/knit: This is based on a hat I saw on T.V