There are six hats in the HyperHat Collection. The patterns are available individually or as a collection.
They are all very easy to make and use basic knit or crochet stitches. Three are knitted, three are crochet. Each pattern includes ideas for variations.
The hats are named in honour of famous women mathematicians. and all incorporate an element of hyperbolic knitting or crochet as pioneered by Daina Taimina.