Ski boot

Ski boot comprising a rigid shell base below a top portion of a boot and provided with an opening and closing system to allow a foot of a skier to be inserted, said shell base having inner sides and at least partially enveloping said foot from a front end of said boot to approximately the area corresponding to an instep of said foot, said boot comprising

• (a) at least one tongue (3, 3'), (25, 25'), (28, 28'), (34, 34'), (40, 40'), (45), (55), (58, 58'), (72, 72'), (75, 75'), (79, 79'), (84, 84'), (90, 90'), (97, 97') transverse with respect to a longitudinal axis of said boot, said at least one tongue being integral with at least one of said inner sides of said shell base (6), (27), (30) (33), (37), (44), (48), (60), (67), (74), (77), (82), (87), (92), and at least partially surrounding the top of said skier's foot, said tongue being adapted to fold down with respect to said shell base along a drop line (15, 15') that is longitudinal to said boot and elevated with respect to a plane (11) of a sole (12) of said boot, in a plane that passes approximately over heads of bones of said foot corresponding to metatarsals (14, 14') and approximately under heads of bones of said malleoli (13, 13'), respectively, and limited along the length of said foot by two planes (9, 10) secant to said plane of said sole and passing through said heads of said bones (13, 13';
• 14, 14') respectively;
• and
• (b) tensioning means coupled with said transverse tongue and located on an exterior of said boot so as to actuate said tongue with respect to said foot once said foot is in said boot.