This hat is made with textured stitches. The hat rim designed to be lifted and it holds up without using a hat wire.
Made with No.4 medium yarn with 5mm crochet hook.
Top down construction with using 2 colors that is simply switched color in every round. (not carried yarn along with stitch)

Size (M, L)
Head Circumference (53-55cm, 56-58cm)

US terms

Documents include 6 pages of written pattern with some pictures

Materials
5.0mm (US H/8) crochet hook
No4, medium, worsted yarn approximately all color together 240 meter

Gauge
15 sts / 16 rows square in single crochet
10 cm x 10 cm