US Patent 7818900 Inner boot, particularly for a sports shoe

Inner boot, particularly for a sports shoe such as a ski boot, an in-line roller skate or an ice skate, comprising a front portion, that covers the toes and part of the forefoot of the user, and a rear portion, that extends at the region of the plantar's arch up to the heel; the front portion is connected to the rear portion by way of one or more interconnection bellows having, in a rest position, its maximum elongation.