A sports boot, especially for cross-country skiing or walking, including an upper, a reinforcement extending at least vertically upwardly on each side of the heel, and a rigid collar encircling at least the ankle, and connected by its sides to the reinforcement, by two anchoring systems ...http://www.google.fr/patents/US5675917?utm_source=gb-gplus-shareBrevet US5675917 - Sports boot with a journalled collar
