The first illustrative embodiment includes a lace or strap which runs behind the heel down the sides of the foot, under the sole of the foot, crosses to opposite sides of the foot, comes up over the toes ending in a cinch. Loops and slots are provided in the shoe to accommodate the additional strap....http://www.google.co.uk/patents/US7343701?utm_source=gb-gplus-sharePatent US7343701 - Footwear having an interactive strapping system
