Fair isle Mug cozy in Yellow Fair isle Mug cozy in Yellow Fair isle Mug cozy in Yellow Yellow jazzy fair isle mug cosy / warmer £9.00 Out of stock. Gorgeous yellow mug hug, hand knitted in Rowan tweed 100% wool (guaranteed to keep things nice and warm) in a lovely mustard yellow with orange and teal highlights. It sits 7 cm high so fits a medium sized mug ! and slides onto the mug with just the handle peeping out. The diameter of the mug I have it sitting on is 8cm. Please hand wash and dry flat. If the cozy gets stretched a little big for the mug , then just soak in warm water , squeeze dry & dry flat into shape.