The perfect hat for those who want a double-knit hat that shows off secret geekdom but who just don’t want something irrational as the Double-knit Pi Hat that close to their brains.

A great first double-knitting project. Fully reversible and very warm. You’ll need around 225yds in each of two colors.

A fun pattern for a ski hat or just for keeping non-skiing ears nice and toasty.

These came about after I tried spinning outside in 50 degree weather and ended up with numb fingers and bulkier-than-expected yarn. They were simultaneously a way to use up small amounts of bulky yarn and a way to prevent it in the future.

The perfect ski hat for the geekishly inclined. The double layers make it wonderfully warm, and should you need to know the first 14 digits of pi, you have them conveniently encoded in the rows and columns of your hat.