A shell, particularly for sports shoes such as ice skates or roller skates or trekking boots. The shell includes a single body that has a first flap and a second flap, at least one of which is arranged transversely to the foot instep. A single fastening device can be arranged between the first and second...http://www.google.co.uk/patents/US5596820?utm_source=gb-gplus-sharePatent US5596820 - Adjustable shell for sports shoes
