This is a super quick project for anyone who has crocheted a hat before. I don't really have a pattern, but if your familiar with adding stitches you will be able to figure it out. To start, chain 3 and then Single Crochet in the first stitch 5-6 times. Your last chain will bring you back to your first chain creating a circle. SC twice in every stitch all the way around. Now this is where it gets tricky. You're basically going to keep adding stitches until your circle's diameter is wide enough to fit whatever you want to koozie. If you add too many it will start to pucker. If you don't add enough it will not stay flat. I honestly do it a little different every time. Once the diameter is wide enough stop adding stitches. Just keep stitching until your koozie is tall enough.