with reference to the above figures , the reference numeral 1 designates the ski boot comprising a shell 2 provided with a first flap 3 and with a second flap 4 which mutually overlap in normal use while skiing by means of adapted levers , not shown in the figure . as shown in fig2 a tab 6 is formed on the lateral edge 5 of the first flap 3 and is folded toward the inside of the shell in the direction of the second flap 4 . the tab 6 forms , when inactive , an acute angle with the internal lateral surface 7 of the first flap 3 . when the first and second flaps overlap , once the necessary levers have been secured , the tab 6 can be partially or fully accommodated within an adapted seat 8 formed longitudinally with respect to the second flap 4 . the use of the invention is thus as follows : when the first and second flaps overlap , during sports practice , the tab 6 improves the seal between the first flap and the second flap by virtue of its deformability . if the skier stops skiing and loosens the levers to walk , the unavoidable mutual separation of the lateral edges of the first and second flaps is compensated by the tab 6 , which still interacts with the second flap and forms a sealing region again by virtue of its elastic deformation . it has thus been observed that the invention has achieved the intended aim and objects , since a ski boot with overlapping flaps has been obtained in which tightness between said flaps is ensured both during sports practice and while walking . the ski boot according to the invention is naturally susceptible to numerous modifications and variations , all of which are within the scope of the same inventive concept . thus , for example , a shell 102 is illustrated which has a first flap 103 and a second flap 104 that can mutually overlap . an elastically deformable tab 106 protrudes toward the overlying first flap 103 at the lateral edge 105 of the second flap 104 . said tab 106 forms an acute angle with the outer lateral surface 109 of the second flap 104 , and its outward edge interacts with the inner lateral surface 107 of the first flap 102 . this second solution also allows to maintain excellent tightness while walking . fig4 illustrates a shell 202 comprising a first flap 203 and a second flap 204 that mutually overlap . a tab 206 protrudes toward the first flap 203 at the lateral edge 205 of the second flap 204 and forms an obtuse angle with the outer lateral surface 209 of the second flap 204 . the outward edge of the tab 206 instead interacts with the inner lateral surface 207 of the first flap 203 . in this condition , too , the tab 206 is elastically deformable , in that its free edge tends to maintain contact with the inner lateral surface 207 of the first flap 203 . fig5 and 6 illustrate a ski boot 301 wherein flaps 303 and 304 are not made integral with the shell but rather associated therewith by means of rivets 333 . the first flap 303 has a tab 306 formed at the edge 305 and , similarly to the embodiment illustrated in fig1 and 2 , the tab 306 can be arranged in an adapted seat 308 provided at the second flap 304 . fig7 illustrates a shell similar to the embodiment illustrated in fig3 wherein , however , the flaps 403 and 404 are riveted to the shell by means of rivets 433 . fig8 illustrates a shell 502 having a first flap 503 and a second flap 504 associated therewith by means of rivets 533 . the first flap 503 has a tab 506 which is adapted to be arranged in a seat 508 provided at the second flap 504 , similarly to the embodiments illustrated in fig2 and 6 . in this case however the tab 506 is not provided at the edge of the flap but rather at a distance therefrom . fig9 illustrates a shell 602 having a first flap 603 and a second flap 604 . flap 604 has a tab 606 projecting outward and provided at a distance from the edge 605 of the second flap 604 . fig1 illustrate a detail of a shell having a first flap 703 and a second flap 704 . the first flap 703 has an outward projecting tab 706 adapted to engage the second flap 704 in a manner similar to that of the embodiment shown in fig3 for example . a border member 707 , made of rubber for example , is provided at the edge 705 of the second flap 704 to improve the sealing action . with regard to the above described embodiments , the shells each have an inside for accommodating a user &# 39 ; s foot . the internal surfaces and external surfaces of each of the flaps face respectively towards and away from the inside of the respective shell . as it may be appreciated from the foregoing description , in each embodiment the elastically deformable tab is connected to one of the overlapping flaps in the various manners as described , in such a manner that the tab is folded with respect to such one flap to form a fold line between the tab and the one flap , and such that the tab has an extension which forms a first angle with respect to an extension of the one flap when the flaps are relatively mutually spaced in an open position . in the embodiments as seen in fig1 - 3 and 5 - 10 , the first angle formed between the extension of the tab and the extension of the flap to which the tab is connected is an acute angle , while in the embodiment seen in fig4 such first angle is an obtuse angle . moreover , the extensions of the tab and of the flap to which the tab is connected intersect , in the open position , at the fold line between the tab and the flap and the first angle formed between such extensions in the open position has a vertex which lies essentially on the fold line . as it may be further appreciated from the foregoing description , the elastically deformable tab in each embodiment is elastically deformable such that when the first and second flaps are relatively mutually closed in a closed position the tab assumes a bent position relative to a position the tab assumed in the open position by being bent along the fold line so as to form a second angle between an extension of the flap to which the tab is connected and an extension of the tab in the closed position , and such that the extensions of the tab and of the flap to which the tab is connected in the closed position intersect at said fold line and the second angle is formed between the extensions in the closed position with a vertex of such second angle lying essentially on the fold line . in each of the embodiments , the above described second angle is different than above described first angle . in the embodiments as seen in fig1 - 3 and 5 - 10 , the first angle in the open position is greater than the second angle in the closed position , while in the embodiment seen in fig4 the first angle in the open position is less than the second angle in the closed position . as it may be further appreciated from the foregoing description of the various embodiments of the invention , the elastically deformable tab in each embodiment is connected to one flap at the above described fold line while the tab is unconnected to the other one of the overlapping flaps in the sense that it is not rigidly connected to such other flap but rather it is capable of freely sliding with respect to such other flap as the flaps are mutually relatively moved between the above described open and closed positions . in particular , in each embodiment , the free outward edge of the tab arranged distally from the fold line interacts or makes contact , in the open position of the flaps , at a contact line of an appropriate surface of the other flap to which the tab is unconnected . this interaction or contact maintains excellent sealing even when the flaps are in their open position , as described previously . however , as the flaps are mutually relatively moved from the open position into the closed position , the tab bends along the fold line resulting in the transformation of the angle formed by the extensions of the tab and of the flap to which the tab is connected , and the free outward edge of the tab is displaced with respect to the contact line as described above in the open position such that the free outward edge is arranged in a new position relative to the respective surface of the flap to which the tab is unconnected . the tab in its bent configuration in the closed position also provides an excellent sealing as described previously . it is apparent that the tab in each of the described embodiments has such a rigidity sufficient so that the free outward edge is kept in essential contact with the contact line of the appropriate surface of the flap to which the tab is unconnected in the open position of the flaps , in order to maintain the described sealing even when the flaps are in their open position . the materials and the dimensions constituting the individual components of the ski boot may naturally be the most pertinent according to the specific requirements .
ski boot comprising a shell with overlapping flaps and improved watertightness . an elastically deformable tab is in fact provided on the lateral edge of at least one of the flaps and is partially or fully folded toward the other flap . this allows optimum tightness when the shell is secured and equally optimum tightness while walking , once sports activity has ended .