an embodiment of the invention , being an ice skate 100 ( for the right foot ), is shown in fig1 . ( other embodiments of the invention include , but are not limited to , left ice skates , and inline roller skates .) skate 100 has a skate boot 102 and a skate blade assembly 104 . skate has a skate boot shell 106 , which is shown with a cut - away to reveal the sub - shells 120 , 122 thereof described in further detail below . skate boot 102 also has a skate boot toe cap 108 , a skate boot tongue 110 , a skate boot liner 118 , and skate boot facing 112 . skate blade assembly 104 has a skate blade 114 and a skate blade holder 116 . the skate boot toe cap 108 , skate boot tongue 110 , skate boot liner 118 , and skate blade assembly 104 and their various components are conventional , and their manufacture , assembly , and use are within the knowledge of one skilled in the art of skate design , and will not be described further herein . fig2 shows an exploded view of the ice skate 100 of fig1 , to allow for a better understanding of the various components thereof . referring particularly to skate boot shell 106 , it will be seen that in this embodiment , skate boot shell 106 has two sub - shells , an outer sub - shell 120 and an inner sub - shell 122 . skate 100 also has an associated reinforcing element 124 ( being a conventional molded plastic ankle protector ), a conventional lace bite protector 128 , and a conventional mid - sole 123 ( for securing the skate blade assembly 104 to the skate boot 102 ). skate liner 118 also has conventional foam ankle padding 126 . fig3 shows an exploded view of the boot shell 106 , showing the two sub - shells , outer sub - shell 120 and inner sub - shell 122 . each of outer sub - shell 120 and inner sub - shell 122 have a three - dimensional shape having a heel portion 120 h and 122 h ( respectively ), an ankle portion 120 a and 122 a ( respectively ), a lateral portion 120 l and 122 l ( respectively ), a medial portion 120 m and 122 m ( respectively ), and a sole portion 120 s and 122 s ( respectively ). thus , referring to fig4 , the boot shell 106 itself , when assembled , has a three - dimensional shape having a heel portion 106 h , an ankle portion 106 a , a lateral portion 106 l , a medial portion 106 m , and a sole portion 106 s . outer sub - shell 120 is a vacuum - molded three - dimensional structure made of surlyn ®, made via a conventional vacuum molding technique . outer sub - shell 120 is three - dimensionally shaped ( when molded ) so as to ( when incorporated into boot shell 106 and when boot shell 106 is incorporated into skate 100 ) conform well to the foot of a wearer during use of the skate 100 . various views of the three - dimensional shape of outer sub - shell 120 can be seen in fig6 and 8 . referring to fig5 , which shows outer sub - shell 120 in cross - section , the thickness 120 t of the outer sub - shell 120 can vary from between about 0 . 1 mm to about 5 mm . preferably , the thickness 120 t is between about 0 . 5 mm to about 5 mm , and more preferably between about 1 mm to about 3 mm . the density of outer sub - shell 120 can vary between about 0 . 75 g / cm 3 and about 1 . 1 g / cm 3 . preferably , the density is between about 0 . 85 g / cm 3 and about 1 . 0 g / cm 3 . more preferably , the density is between about 0 . 9 g / cm 3 to about 1 . 0 g / cm 3 . most preferably , the density is between about 0 . 95 g / cm 3 to about 0 . 98 g / cm 3 . inner sub - shell 122 is an injection molded three - dimensional structure made of epp , made via a conventional injection technique ( with resin being injected into and then being allowed to expand in the mold ). inner sub - shell 122 is shaped so as to ( when incorporated into boot shell 106 and when boot shell 106 is incorporated into skate 100 ) conform well to the foot of a wearer during use of the skate 100 . various views of the three - dimensional shape of the inner sub - shell 122 can be seen in fig7 and 9 , showing the assembled boot shell 106 . although not shown , the thickness of the inner sub - shell 122 is generally constant in this embodiment ( although it may vary in others ). preferably , the thickness of the inner sub - shell 122 is between about 1 mm to about 15 mm . more preferably , the thickness of the inner sub - shell 122 is between about 2 mm to about 10 mm . still more preferably , the thickness of the inner sub - shell 122 is between about 4 mm to about 8 mm . yet more preferably , the thickness of the inner sub - shell 122 is between about 5 mm to about 6 mm . most preferably , the thickness of the inner sub - shell 122 is about 5 . 4 mm . the density of inner sub - shell 122 can vary between about 0 . 016 g / cm 3 ( 1 lb / ft 3 ) and about 0 . 32 g / cm 3 ( 20 lb / ft 3 ). preferably , the density is between about 0 . 032 g / cm 3 ( 2 lb / ft 3 ) and about 0 . 16 g / cm 3 ( 10 lb / ft 3 ). more preferably , the density is between about 0 . 80 g / cm 3 ( 5 lb / ft 3 ) and about 0 . 96 g / cm 3 ( 6 lb / ft 3 ). most preferably , the density is about 0 . 83 g / cm 3 ( 5 . 2 lb / ft 3 ). referring to fig3 , inner sub - shell 122 has an outer surface 122 o having a contoured three dimensional shape . outer sub - shell 120 has an inner surface 120 i having a contoured three dimensional shape . the contoured shapes of the outer surface 122 o and the inner surface 120 i are complimentary such that when the inner sub - shell 122 is placed within the outer sub - shell 120 , the surfaces 122 o , 120 i register well in forming the boot shell 106 . further , as can be seen in the figures , both the outer sub - shell 120 and the inner sub - shell 122 are shaped so as to have ridges 120 r , 122 r ( respectively ) on their outer surfaces 120 o , 122 o ( respectively ) to provide reinforcement . the ridge 122 r on the outer surface 122 o of the inner sub - shell 122 is complimentary with a ridge - receiving shape 125 on the inner surface 120 i of the outer - shell 120 , such that they register when the boot shell is formed ; and , together with the ridge 120 r of the outer sub - shell , form boot shell reinforcement ridge 106 r . referring to fig4 , 7 and 9 , when the inner sub - shell 122 is placed within the outer sub - shell 120 to form boot shell 106 , in this embodiment , the entirety of the outer surface 122 o of the inner sub - shell 122 is covered by the inner surface 120 i of the outer sub - shell 120 . boot shell 106 is assembled by first coating the outer surface 122 o of inner sub - shell 122 with a conventional adhesive and then placing inner sub - shell 122 within outer sub - shell 120 . once boot shell 106 is assembled , skate 100 is assembled in a conventional manner with the exception of facing 112 ( which is made of eva ). in skate 100 , ( in contrast with conventional facings ) facing 112 is secured to boot shell 106 via stitching 113 only along the bottom portion of the facing . thus , the majority of the body 117 of facing 112 ( including the eyelets 115 ) neither underlies nor overlies the boot shell 106 and it is not secured to the boot shell . this leaves the majority of the body 117 of facing 112 free to stretch , move , contract , etc . during use of the skate 100 , adding to the skate &# 39 ; s flexibility . referring now to fig1 and 11 , there is shown a second embodiment of the present invention , being skate boot shell 206 ( for a right skate — the full skate has been omitted for ease of illustration since it is otherwise conventional ), which is similar to the skate boot shell 206 with some exceptions . in this embodiment each of the outer sub - shell 220 and inner sub - shell 222 are formed as two halves . thus , outer sub - shell 220 has a right half 236 and a left half 234 . similarly inner sub - shell 222 has a right half 232 and a left half 230 . outer sub - shell 220 has a heel portion 220 h , a part of which is located on right half 236 and a part of which is located on left half 234 . outer sub - shell 220 also has an ankle portion 220 a , a part of which is located on right half 236 and a part of which is located on left half 234 . outer sub - shell 220 also has a medial portion 220 m located on the left half 234 and a lateral portion 220 l located on the right half 236 . outer sub - shell 220 also has a sole portion 220 s , a part of which is located on right half 236 and a part of which is located on left half 234 . inner sub - shell 222 has a heel portion 222 h , a part of which is located on right half 232 and a part of which is located on left half 230 . inner sub - shell 222 also has an ankle portion 222 a , a part of which is located on right half 232 and a part of which is located on left half 230 . inner sub - shell 222 also has a medial portion 222 m located on the left half 230 and a lateral portion 222 l located on the right half 232 . inner sub - shell 222 also has a sole portion 222 s , a part of which is located on right half 232 and a part of which is located on left half 230 . inner sub - shell 222 has an outer surface 222 o ( split across its left half 230 and its right half 232 ). outer sub - shell 220 has an inner surface 220 i ( split across its left half 234 and its right half 236 ). the outer surface 222 o of the inner sub - shell 220 is complimentary with the inner surface 220 i of the outer sub - shell 220 such that the two register well when the sub - shell halves 230 , 232 and 234 , 236 are formed into a whole sub - shell 222 and 220 ( respectively ) and the resultant sub - shells 220 , 220 are assembled into boot shell 206 . outer sub - shell halves 234 , 236 are each a vacuum - molded three - dimensional structure made of surlyn ®, made via a conventional vacuum molding technique . once manufactured , outer sub - shell halves 234 , 236 are secured together at surfaces 243 via any suitable conventional technique ( e . g . bonding , fastening , stitching etc .) to form joint 244 ( in fig1 ) and thus outer sub - shell 220 ( which is otherwise similar to outer sub - shell 120 of the first embodiment , skate 100 ). once manufactured , inner sub - shell halves 230 , 232 are secured together at surfaces 242 via any suitable conventional technique ( e . g . bonding , fastening , stitching , etc .) to form joint 245 ( in fig1 ) and thus inner sub - shell 222 ( which is otherwise similar to inner sub - shell 220 of the first embodiment , skate 100 ). boot shell 206 is then assembled as is described above in relation to the first embodiment , skate 100 . modifications and improvements to the above - described embodiments of the present invention may become apparent to those skilled in the art . the foregoing description is intended to be exemplary rather than limiting . the scope of the present invention is therefore intended to be limited solely by the scope of the appended claims .
a skate having a skate boot with a non - lasted boot shell , the shell having a first non - lasted three - dimensional sub - shell and a second non - lasted three - dimensional sub - shell , the second sub - shell being interior to and adjoining the first sub - shell , the first sub - shell comprising a first material having a first density and the second sub - shell comprising a second material having a second density , the second density being less than the first density , the shell being shaped so as to have a heel portion , an ankle portion , a lateral portion , a medial portion , and a sole portion ; and a ground - engaging assembly disposed on an underside of the skate . additional sub - shells are possible . methods of manufacturing the skate boot shell , including molding and build - up , are also disclosed .