as illustrated in fig1 to 8 , a board for gliding over snow , such as an alpine ski ( 1 ), comprises a shovel ( 2 ), a tail turn - up ( 3 ), a waist zone ( 4 ), two side edges ( 5 ), a top surface ( 6 ) formed by a protective , decorative upper layer , and a bottom surface ( 7 ) delimited on either side by the two side edges ( 5 ). according to paragraph 3 . 1 . 8 of iso standard 6289 , the shovel ( 2 ) is defined as being the forward section of the ski ( 1 ), which is turned up in order to ride easily over obstacles . according to paragraph 3 . 1 . 12 of the same standard , the tail turn - up ( 3 ) is defined as being the portion of the ski ( 1 ) rearward of the rear contact line . according to paragraph 3 . 1 . 1 . of the same standard , the bottom surface ( 7 ) is defined as being the side of the ski ( 1 ) which interfaces the snow when skiing . the bottom surface ( 7 ) corresponds essentially to the gliding base bordered by side edges ( 5 ). the shovel ( 2 ) comprises the tip ( 8 ) of the ski ( 1 ). according to paragraph 3 . 1 . 6 of the same standard , the tip ( 8 ) is defined as being the extreme forward point of the ski ( 1 ). the ski ( 1 ) with the shovel ( 2 ) has a forward contact line ( l cav ). according to paragraph 3 . 1 . 9 of the same standard , the forward contact line ( l cav ) is defined as being the forwardmost contact line between the bottom surface ( 7 ) of the ski ( 1 ) and a flat surface ( p h ) against which the ski ( 1 ) is pressed . the width of the ski ( 1 ) at the forward contact line ( l cav ) is substantially between 85 and 115 mm . preferably , the width of the ski ( 1 ) is substantially between 90 and 110 mm . solely by way of example , this width is substantially equal to 103 mm . the ski ( 1 ) with the shovel ( 2 ) has a width of the shoulder of the ski line ( l bv ) that is distinct and located forward of the forward contact line ( l cav ) toward the tip ( 8 ) of the ski ( 1 ). according to paragraph 4 . 7 . 2 . 1 of the same standard , the width of the shoulder of the ski ( b v ) is defined as being the maximum width of the shovel section of the ski ( 1 ). a height ( h av ) of the width of the shoulder of the ski line ( l bv ) is measured between the bottom surface ( 7 ) and the horizontal planar surface ( p h ) ( see fig2 and 3 ). according to the invention , a value for the height ( h av ) that has given a particularly high - performance ski is substantially 10 mm . when the ski ( 1 ) is on the edge ( 5 ), the width of the shoulder of the ski line ( l bv ) becomes the temporarily effective forward contact line . at the start of the turn , the width of the shoulder of the ski line ( l bv ) is stressed first of all , which makes the ski ( 1 ) engage more quickly and more progressively when initiating the turn . a distance ( d av ) is measured between the forward contact line ( l cav ) and the width of the shoulder of the ski line ( l bv ) ( see fig2 , 3 , and 4 ). this is the distance ( d av ) projected onto the horizontal planar surface ( p h ). according to the invention , a value for the distance ( d av ) that has given a particularly high - performance ski is substantially 65 mm . the width of the shoulder of the ski ( b v ) is measured from edge to edge at the width of the shoulder of the ski line ( l bv ) ( see fig2 , 3 , and 4 ). according to the invention , a value for the width of the shoulder of the ski ( b v ) that has given a particularly high - performance ski is substantially 109 mm . the length of the shovel ( l s ) is measured between the tip ( 8 ) and the forward contact line ( l cav ) ( see fig2 , 3 , and 4 ). this is the length ( l s ) projected onto the horizontal planar surface ( p h ). according to the invention , a value for the length of the shovel ( l s ) that has given a particularly high - performance ski is substantially 160 mm , which corresponds to approximately 175 mm for a “ developed ” shovel length . according to paragraph 4 . 10 of the same standard , the tip height ( h s ) is defined as being the height of the underside of the tip ( 8 ) measured from a planar surface ( p h ) with the ski body pressed against the surface . this height ( h s ) of the shovel ( 2 ) is substantially between 25 and 60 mm . preferably , the tip height ( h s ) may be substantially between 35 mm and 55 mm . in addition , for a particularly high - performance ski ( 1 ), this height ( h s ) may be very preferably substantially equal to 45 mm . the tail turn - up ( 3 ) comprises the rear tail ( 9 ) of the ski ( 1 ). according to paragraph 3 . 1 . 7 of the same standard , the tail ( 9 ) is defined as being the extreme rear - edge point of the ski ( 1 ). the ski ( 1 ) with the tail turn - up ( 3 ) has a rear contact line ( l car ). according to paragraph 3 . 1 . 10 of the same standard , the rear contact line ( l car ) is defined as being the rearmost contact line between the bottom surface ( 7 ) of the ski ( 1 ) and a flat surface ( p h ) against which the ski body is pressed . the width of the ski ( 1 ) at the rear contact line ( l car ) is substantially between 80 and 120 mm . preferably , the width of the ski ( 1 ) is substantially between 90 and 110 mm . solely by way of example , this width is substantially equal to 92 mm . the ski ( 1 ) with the tail turn - up ( 3 ) has a width of the heel of the ski line ( l bh ) that is distinct and located rearward of the rear contact line ( l car ) toward the tail ( 9 ) of the ski ( 1 ). according to paragraph 4 . 7 . 2 . 3 of the same standard , the width of the heel of the ski ( b h ) is defined as being the maximum width of the running surface in the rear section of the ski ( 1 ). a height ( h ar ) of the width of the heel of the ski line ( l bh ) is measured between the bottom surface ( 7 ) and the horizontal planar surface ( p h ) ( see fig5 and 6 ). according to a second aspect of the invention , a value for the height ( h ar ) that has given a particularly high - performance ski is substantially 4 mm . when the ski ( 1 ) is on the edge ( 5 ), the width of the heel of the ski line ( l bh ) becomes the temporarily effective rear contact line . upon exiting a curve , the width of the heel of the ski line ( l bh ) is stressed last , which makes the ski ( 1 ) grip better at the end of the turn . a distance ( d ar ) is measured between the rear contact line ( l car ) and the width of the heel of the ski line ( l bh ) ( see fig5 , 6 , and 7 ). this is the distance ( d ar ) projected onto the horizontal planar surface ( p h ). according to the invention , a value for the distance ( d ar ) that has given a particularly high - performance ski is substantially 40 mm . the width of the heel of the ski ( b h ) is measured from edge to edge at the width of the heel of the ski line ( l bh ) ( see fig5 , 6 , and 7 ). according to the invention , a value for the width of the heel of the ski ( b h ) that has given a particularly high - performance ski is substantially 100 mm . the length of the tail turn - up ( l t ) is measured between the tail ( 9 ) and the rear contact line ( l car ) ( see fig5 , 6 , and 7 ). this is the length ( l t ) projected onto the horizontal planar surface ( p h ). according to the invention , a value for the tail - turn - up length ( l t ) that has given a particularly high - performance ski is substantially 40 mm . in another , particularly advantageous embodiment , the width of the heel of the ski line ( l bh ) is moved back as far as the tail ( 9 ). in this case , the width of the heel of the ski ( b h ) is equal to the width of the tail ( 9 ). in addition , the distance ( d ar ) between the rear contact line ( l car ) and the width of the heel of the ski line ( l bh ) is equal to the tail - turn - up length ( l t ). according to paragraph 4 . 11 of the same standard , the tail height ( h t ) is the height of the underside of the tail ( 9 ) measured from a planar surface ( p h ) with the ski body pressed against the surface . this height ( h t ) of the tail ( 9 ) is substantially between 1 mm and 50 mm . preferably , the tail height ( h t ) may be substantially between 2 mm and 25 mm . in addition , this height ( h t ) may be very preferably substantially equal to 4 mm . the width at the waist ( 4 ) is substantially between 60 mm and 90 mm . preferably , the width at the waist ( 4 ) may be substantially between 65 mm and 85 mm , and preferably substantially equal to 68 mm . when the skier takes a turn , he angles his ski ( 1 ) relative to the slope . thus , when the ski ( 1 ) is positioned on one of the two edges ( 5 ) during a turn ( see fig8 and 9 ), it flexes under the bearing forces generated by the skier while edge - gripping . the edge at the waist zone ( 4 ) is pressed against the snow . the distance ( d av ) between the forward contact line ( l cav ) and the width of the shoulder of the ski line ( l bv ), and the distance ( d ar ) between the rear contact line ( l car ) and the width of the heel of the ski line ( l bh ), which are inactive and raised when the ski ( 1 ) is flat , become stressed lengths while edge - gripping . the distance ( d eff ) between the width of the shoulder of the ski line ( l bv ) and the width of the heel of the ski line ( l bh ) becomes the stressed edge length . the present invention is not limited to the embodiments described and illustrated . numerous modifications may be made without thereby departing from the context defined by the scope of the set of claims . in particular , the principle of the invention may be applied to a snowboard in which the wider shovel and tail zones are raised relative to a horizontal plane by a height in excess of 5 mm so as to make grip when initiating and exiting a turn more progressive , whether backside or frontside .
a snow board , the camber of the side cut of which is accentuated , including a bottom surface with a forward contact line , which is a forward limit of the contact zone of the bottom surface on a horizontal planar surface , the board being placed on the horizontal planar surface , and a shovel , which is a forward part of the board that is curved upward in order to overcome obstacles , the shovel having a width of the shoulder of the ski line , defined as being a line on the bottom surface in the shovel zone at the location where its width is at a maximum , wherein the height of the width of the shoulder of the ski line , measured between said bottom surface and said horizontal planar surface , is about 5 mm and to 15 mm .