POM London Handmade Crochet Beanie Skull Hat (Black, Charcoal, Gray) POM London Handmade Crochet Beanie Skull Hat (Black, Charcoal, Gray) Colour: Black, Charcoal, Gray Size: One size fits all, stretchable (will fit 22"/56cm head up to 24"/61cm head) (custom made can be ordered for the same price). Yarn: 100% Acrylic, (charcoal 75% acrylic 25% wool) *How to measure your size. Using a tape measure, measure the widest part of your head, just above your ears and eyebrows.