This is a classical stranded knit hat.

This is one of those patterns that emerged, when I just watched the clouds and mindlessly scribbled something. Most often, the mittens come about first and then the matching hat.

A matching hat or mittens pattern is available here:
https://natturuprjon.is/products/klosigar-uppskriftir

Gift kit available with Náttúruprjón’s hand dyed yarn and pattern:
https://natturuprjon.is/products/klosigar-gjafapakki