Sports boot

A sports boot comprising:

• an inner boot;
• an exogenous shell, whose dimensions allow said inner boot to be inserted into or extracted from it, said exogenous shell strengthening said inner boot and allowing it to be attached to a piece of sports equipment said exogenous shell comprising a sole and an upper, wherein the upper comprises a forward part and a rear part, said rear part having an interior surface facing into the exogenous shell, and wherein an opening is formed at the interior surface of the rear part;
• and
• a reinforcement part provided to the interior surface of the rear part of the upper and configured to be located adjacent to an Achilles tendon, wherein the reinforcement part is articulated on an axis that is fixed and stationary relative to the sole of the exogenous shell separately from the rear part of the upper,
• wherein the reinforcement part includes a tenon configured to be removably inserted into the opening such that when the exogenous shell is in a closed position, the tenon is inserted into the opening in order to fasten the reinforcement part to the rear part of the upper, and
• wherein said sole comprises a continuous inner relief pattern constituted by longitudinally-extending ribs separated by longitudinally-extending grooves extending continuously along an entire length of the sole, the inner boot comprising a sole with a corresponding relief pattern, so as to position laterally and vertically said inner boot in the exogenous shell.