A quick and simple beanie in a bulky yarn means you have a hat that works up in no time. Done in shepherd knitting/slip stitch crochet, it creates a warm fabric without the density of standard crochet.

A good introductory hat to this crochet technique, and you can create it with or without the brim. One size, but hats made fit both children through adult due to the stretchy nature of the stitches.