Boot for ski touring, comprising a shell which is provided with a sole for resting on the ground, on said shell an upper cuff being applied, upper being referred to the position of said upper cuff on said boot with respect to the ground, said upper cuff being intended to be fixed to said shell in correspondence with a first hinging point which is located on a first flank of said boot and a second hinging point which is located on a second flank of said boot, said first hinging point and said second hinging point allowing for an inclination of said upper cuff with respect to said shell, said boot being provided with locking means (16, 17, 23) comprising a lever hinged at a third hinging point and rotating between at least: - a first position in which said lever is mechanically locked on a coupling element, said mechanical locking corresponding to a mechanical locking of said upper cuff on said shell preventing said inclination of said upper cuff with respect of said shell; - a second position in which said lever is in an unlocked condition with respect to said coupling element, said lever releasing said mechanical locking enabling said inclination of said upper cuff with respect to said shell; wherein said lever is a rotating lever which is rotating on said third hinging point according to a first rotational axis which lies on a first plane which is an essentially orthogonal plane with respect to a second plane corresponding to the resting plane of said boot on the ground, said first plane being a longitudinal plane of essential symmetry for the shape of said upper cuff or said shell, the locking of said lever on said coupling element occurring following a rotation of said lever around said first rotational axis from said second position to said first position and following an insertion of a clamping element which is inserted into and couples with said coupling element, the unlocking of said lever from said coupling element occurring following a rotation of said lever around said first rotational axis from said first position to said second position with the extraction of said clamping element which is extracted with respect to said coupling element following said rotation of said lever, said locking means (16, 17, 23) being essentially placed at the back of said boot, "at the back" being referred to a zone of the boot which is a zone in which a back connection is obtained which is suitable for hooking to a ski, "at the back" being referred to a zone of the boot which is an opposite zone with respect to a fore zone in which a front connection is obtained which is suitable for hooking to a ski according to the usual conventions adopted in the field of skiing, said boot being characterised in that said first rotational axis is inclined at a first angle (a) with respect to a second axis which coincides with the axis according to which said upper cuff is inclined with respect to said second plane, said second axis being inclined with respect to said second plane at a second angle (b), said first angle (a) being an angle preferably between 75° and 105°, even more preferably between 85° and 95°, the preferred value being approximately 90°, said second angle (b) being an angle preferably between 45° and 130°, even more preferably between 70° and 110°, the preferred value being approximately 75°. - a first position in which said lever is mechanically locked on a coupling element, said mechanical locking corresponding to a mechanical locking of said upper cuff on said shell preventing said inclination of said upper cuff with respect of said shell; - a second position in which said lever is in an unlocked condition with respect to said coupling element, said lever releasing said mechanical locking enabling said inclination of said upper cuff with respect to said shell;