SKYLRK Sunken Mule Cave US 13 UK 12 New in Box SKYLRK Sunken Mule in Cave. New in box with original SKYLRK box included. Tagged US 13 / UK 12 / EU 47.5. Rounded closed toe, open-back slip-on shape and charcoal-toned upper with black sole. Price is for one pair. US shipping $18; international shipping $70 to Canada, the UK and Europe only. Offers welcome. Women size 13. One of Justin Bieber's greatest!