From the Knit Rowan website:
Knit this men’s or women’s unisex rib and slip stitch hat accessory from the brochure Big Accessories, designed by Martin Storey using Thick ‘n’ Thin (merino wool). This pattern is for the beginner knitter.

Finished dimensions:
Designed to fit an average person’s head.

Yarn Information:
Photographed in Cavern 977
3 skeins
162 yards