This is my second version of this beautiful pattern. (Two skeins are enough to make 2 hats in reverse color).
I have chosen a smaller size this time and the fit is better for that kind of beanie hat. My husband is very happy with the result !

Modifications :
Old norvegian Cast on : https://www.youtube.com/watch?v=bZVZnt7F7

Hat body :
Knitted 11.5cm from the cast-on edge before the crown shaping

Decreases :
1 : k
2 : k2tog; k6
3->4 : k
5 : k5, ssk
6->7 : k
8: k2tog, k4
9->10 : k
11 : k3, ssk
12->13 : k
14 : k2tog, k2
15->16 : k
17 : k1, ssk
18 : k
19 : k2tog