This hat has been a joy to make and gave me the Eureka moment for cracking down how to work a polka dot pattern in crochet. The pattern uses bobbles and Spike Sc and can be classified as advanced beginner. Since the pattern describes with pictures how to work a bobble as well a a spike sc it should be easy for beginner level crocheters too. Please note that a bobble is not a popcorn and is far easier to work though they both look quite similar.