There are many reasons to love sustainable knitwear brand, Herd. Here are our top three: it uses wool sourced locally, from Lancashire, Yorkshire and Cumbria; its wools are dyed without the use of toxic chemicals, so everything is fully circular; and its buttons are made from Tagua nut, a tree which relies on the biodiversity of the rainforest to survive, so its trade value prevents Amazonian deforestation (sometimes even tiny things can make a big difference).