The body is mostly half double crochet, with a few rounds through just one of the loops instead of both to form ridges. A little bit of leftover bright pink yarn from another project provides interest in stripes. The hem of the hat is all worked just through one of the back legs to form bridges all the way around to differentiate it from the body of the hat. I make most of my hats in half double crochet – it’s faster than single crochet, but more dense than double crochet.