I used a pattern from my local yarn shop Strikkestua.
(Pattern in Norwegian can be found many places on the internet for free)
Crochet needle 5 mm (4,5 recommended)
Dale Baby Yarn, (two strands), Red 4536 and Grey 0007.
Here is the original hat:
|Marit Bjørgen and Heidi Weng,Norway|
Olympic Games 2014, Sotsji, Russia