Butterflys Mug cozy Butterflys Mug cozy Butterflys Mug cozy Butterflys fair isle mug cosy / warmer £9.50 Quantity: at £9.50 each Add To Basket 1 in stock. Butterfly Mug Cozy hand knit in a fair isle pattern in 100% Rowan tweed wool (guaranteed to keep things nice and warm). Coral / Deep red butterflies sit on a light blue background.It sits 8 cm high and slides onto the mug with just the handle peeping out. The diameter of the mug I have it sitting on is 8cm. Ready to ship now. 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.