Warm head is a basic double brim hat pattern that is easily adjusted by adding or removing 8 sts from the begining cast on number.
The hat starts with a provosional cast-on,. You knit to double the length wated for the brim. The fabric created is then folded and knit together to create the double thickness brim. You then continue knitting int he round until you want to decrease.

Any worsted weight yarn will work for this pattern

smallest size used aprox 30gr of yarn.
biggest sized used aprox 76 gr of yarn