Red Fair Isle Mug Cosy Red Fair Isle Mug Cosy Red Fair Isle Mug Cosy (1 ratings) Red and tan fair isle mug cosy / warmer £10.50 Out of stock. Wonderful festive mug cosy , hand knitted in Rowan tweed 100% wool (guaranteed to keep things nice and warm) in a lovely deep red with a great geometric pattern in a tan colour. It sits 10 cm high so fits a nice big 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.