Size guide Support our endangered birds with this merino wool Hawfinch bobble hat. Part of our Matt Sewell + Silverstick collection. The colors of this hat are inspired by Matt's painting of the Hawfinch, an endangered bird on the UK's red list. 10% of sales from this product go to Wildcard, a grassroots environmental conservation organization focusing on rewilding Britain. 100% merino wool Smooth knit Red Bird organic cotton label Handwash only and dry flat One Size fits all. Try this garment on at home. Returns in the UK are free. This bobble hat is made in Britain using traditional methods and fine-grade merino wool yarns. In accordance with Õko-Tex Standard 100 and ISO 17050-1, the merino wool is colored using azo and chlorine-free textile dye.