If he got frostbite you musn't have done a very good job ey. If you use the right materials a crochet beanie will be warm enough for anywhere. We have happy customers in the BC back country and the Kootenays as we speak.
I've worm mine everywhere from Aus to NZ, BC, Europe and Japan with no worries. They can be made as thick and warm as you like.
You write I must not have done a very good job. I doubt you are even a registered business or company. Ron Ermal is wack, last seasons fashion.