100% superwash merino; each skein of this 4ply yarn has 100 grams & 400 yards. it can be washed on a gentle wool cycle in your washing machine, although i'd recommend hand-washing for longer life.  inspired by Julie Fowlis' beautiful gaelic version of the Beatles song "Blackbird", this colourway is hand-dyed in the deep blue-black of a blackbird's feathers.