Sports shoe (1; 1001; 2001; 3001; 4001) comprising: - a lower part adapted to surround the foot of a user; - means for connecting the lower part to an upper part that is designed to surround the lower leg of the user and that is movable relative to the lower part; - means for at least partially blocking movements of the lower part relative to the upper part; - the connection means being disposed in a rear zone of the shoe in line with the heel, said connection means comprising a double-hinge, a ball joint or a flexible lug; - the blocking means comprising a blocking element (7; 1007; 2007; 3007; 4007), including an arch (71; 1071) surrounding a rear zone of the sports shoe, which arch is rotationally articulated with the lower part or the upper part and is movable relative to the lower part or the upper part between a blocking position, in which the blocking means at least partially lock the movements of the upper part relative to the lower part, and an unblocking position, in which the blocking means allow free movement of the upper part relative to the lower part, and when the blocking element (7; 1007; 2007; 3007; 4007) is in the unblocking position, the connection means simultaneously allow: - a longitudinal bending movement of the upper part relative to the lower part around a first axis perpendicular to a longitudinal median plane of the sports shoe; and - a lateral bending movement of the upper part relative to the lower part around a second axis generally parallel to a longitudinal axis (X-X') of the sports shoe. - a lower part adapted to surround the foot of a user; - means for connecting the lower part to an upper part that is designed to surround the lower leg of the user and that is movable relative to the lower part; - means for at least partially blocking movements of the lower part relative to the upper part; - the connection means being disposed in a rear zone of the shoe in line with the heel, said connection means comprising a double-hinge, a ball joint or a flexible lug; - the blocking means comprising a blocking element (7; 1007; 2007; 3007; 4007), including an arch (71; 1071) surrounding a rear zone of the sports shoe, which arch is rotationally articulated with the lower part or the upper part and is movable relative to the lower part or the upper part between a blocking position, in which the blocking means at least partially lock the movements of the upper part relative to the lower part, and an unblocking position, in which the blocking means allow free movement of the upper part relative to the lower part, and when the blocking element (7; 1007; 2007; 3007; 4007) is in the unblocking position, the connection means simultaneously allow: - a longitudinal bending movement of the upper part relative to the lower part around a first axis perpendicular to a longitudinal median plane of the sports shoe; and - a lateral bending movement of the upper part relative to the lower part around a second axis generally parallel to a longitudinal axis (X-X') of the sports shoe. - a longitudinal bending movement of the upper part relative to the lower part around a first axis perpendicular to a longitudinal median plane of the sports shoe; and - a lateral bending movement of the upper part relative to the lower part around a second axis generally parallel to a longitudinal axis (X-X') of the sports shoe.