the invention provides a sole and an insole for a shoe . both the sole and insole are made of multiple layers that wear or degrade at different rates such that wear patterns can be discerned . the wear patterns provide different types of information to a user . for example , a motivational message or graphic may be revealed by wear , or the wear pattern may indicate that footwear needs to be replaced . by developing the shoe sole and insole in layers of material having different densities and thicknesses , a different layer of information / color / feedback can be exposed as material is worn away at different rates . the present invention also relates to the manufacture and development of shoe soles and insoles . more specifically , the invention relates to the manufacture and development of soles and insoles that are composed of layers of materials . preferably , the soles and insoles of the invention are composed of different types and densities of materials . the material of the shoe is manufactured in layers of color , graphics , etc . to provide subsequent feedback to an owner , runner , shoe user , etc . as the sole and insole of the shoe encounters friction , the makeup of the sole and insole changes due to the wearing away of material . this degradation of the sole and insole provides an indication of the portion ( s ) that have endured the most and least wear . the invention takes advantage of this pattern of wear or degradation to communicate information . for example , information about the physical state of the shoe or a motivational message can communicated to the user . the advantages of the present invention include , without limitation , that it is able to degrade the material of the sole or insole in a controlled manner that tracks the areas of contact with either the ground or foot , respectively , and provides a means of quantifying the amount of material degraded due to the quantity of contact . referring now to the invention in more detail , fig1 shows a foot 10 that is inside the shoe . the foot 10 represents the person using the shoe . the foot 10 is in contact with the insole 11 of the shoe . the insole 11 of the shoe has two or more ( i . e . multiple ) layers of material 14 that can come in contact with the foot 10 . the friction between the foot 10 and the insole 11 causes the top most layer of material 16 to degrade or wear away from the insole 11 . after degradation of this layer 16 of the insole 11 , the next layer of material 17 of the insole 11 will come in contact with the foot 10 . similarly , this next layer of material 17 can be degraded by friction with the foot 10 to expose another layer of the insole 11 . subsequent layers of the insole 11 can continue to degrade via friction with the foot 10 until the outer layer 12 of the insole 11 is exposed . over time , degradation of a layer may be partial or even complete . in further detail , still referring fig1 , the outer layer 12 of the insole 11 transitions from the insole 11 to the sole 13 . that is , it is desirable that the outer layer 12 of the insole 11 is in contact with the topmost layer 20 of the sole 13 . the sole 13 is constructed of two or more layers ( i . e . multiple ) of material 15 and the outermost layer 18 is the one that initially comes in contact with the ground 9 . friction between the sole 13 and the ground 9 causes the outermost layer of material 18 to degrade or wear away from the sole 13 . after degradation of this outermost layer 18 of the sole 13 , the next layer of material 19 of the sole 13 will come in contact with the ground 9 . similarly , this next layer of material 19 can be degraded by friction with the ground 9 to expose one or more underlying layers of the sole 13 , which can also be degraded via friction with the ground 9 until the uppermost layer 20 of the sole 13 is exposed . over time , degradation of a layer may be partial or even complete . the multiple layers 14 of the insole 11 continue the length of the foot 10 . the multiple layers 14 can be composed of different materials such as rubber , plastics , and the like , and also of different colors and textures . these multiple layers 14 can also be composed of different densities or thicknesses of materials . the multiple layers 15 of the sole 13 also continue the length of the foot 10 . the multiple layers 15 can be composed of different materials such as rubber , plastics and the like , and also of different colors and textures . the multiple layers of materials 15 can also be composed of different densities or thicknesses . both the multiple layers 14 of the insole 11 and multiple layers 15 of the sole 13 can be developed or made using different manufacturing processes such as injection molding , heating and gluing , and the like . those of skill in the art will be familiar with such processes and their suitability for use in the manufacture of insoles and soles for shoes . fig2 generally shows the wear or degradation of an insole or sole over time . in general , the areas corresponding to the heel and ball of a foot are exposed to a greater amount of friction as compared to a foot &# 39 ; s instep area . for example , fig2 a represents the unworn , non - degraded state of the material of a sole or insole . fig2 b represents the initial wear down pattern ( darker greys ) of the sole or insole . the increasingly darker greys at areas corresponding to the ball and heel of the foot represent the areas of greater wear as compared to the area corresponding the middle of a foot ( i . e . the instep area ). fig2 c represents further wear of the sole or insole where the further darkening of the greys indicates further wear of the sole or insole . the invention takes advantage of these areas of wear to utilize the exposed underlying layer ( s ) as a way to convey information . for example , the information may be motivational to encourage further physical activity by a child or adult , or the information may provide data about the physical state of the shoe and its remaining usable life . the exposed underlying layer ( s ) may comprise one or more different colors , graphic symbols , or words that can be used to provide information . another configuration of the invention is shown in fig3 . fig3 shows a foot 10 that is inside a shoe and is in contact with the insole 11 of the shoe . the insole 11 of the shoe has two or more ( i . e . multiple ) layers of material 14 . the friction between the foot 10 and the insole 11 causes the topmost layer of material 16 to degrade or wear away from the insole 11 . after degradation of this uppermost layer 16 of the insole 11 , the next or second layer of material 17 of the insole 11 will be exposed and come into contact with the foot 10 . similarly , this second layer of material 17 can be degraded by friction with the foot 10 to expose a further layer beneath the second layer 17 . subsequent layers of the insole 11 can continue to degrade via friction with the foot 10 until the outermost layer 12 of the insole 11 is exposed to the foot 10 . over time , degradation of any layer may be partial or even complete . in fig3 , the outer layer 12 of the insole 11 transitions from the insole 11 to the sole 13 . that is , it is desirable that the outer layer 12 of the insole 11 is in contact with the topmost layer 22 of the sole 13 . the sole 13 is constructed of two or more layers ( i . e . multiple ) of material 15 such that the outermost layer 21 is the one that initially comes in contact with the ground 9 . these multiple layers 15 of the sole 13 may be similar in thickness and shape to each other as illustrated in fig2 , or they may vary in thickness or shape as represented in fig3 . friction between the sole 13 and the ground 9 causes the outermost layer of material 21 to degrade or wear away from the sole 13 . after degradation of this outermost layer 21 of the sole 13 , the next layer of material 22 of the sole 13 will be exposed and come in contact with the ground 9 . similarly , this next layer of material 22 can be degraded by friction with the ground 9 to expose one or more further underlying layers of the sole 13 . subsequent layers of the sole 13 can continue to degrade via friction with the ground 9 until the uppermost layer 22 of the sole 13 is exposed . over time , degradation of a layer may be partial or even complete . in fig3 the multiple layers 14 of the insole 11 continue the length of the foot 10 . the multiple layers 14 can be composed of different materials such as rubber , plastics , and the like , and also of different colors and textures . these multiple layers 14 can also be composed of different densities or thicknesses of materials . the multiple layers 15 of the sole 13 also continue the length of the foot 10 . the multiple layers 15 can be composed of different materials such as rubber , plastics and the like , and also of different colors and textures . the multiple layers of materials 15 can also be composed of different densities or thicknesses . both the multiple layers 14 of the insole 11 and multiple layers 15 of the sole 13 can be developed or made using different manufacturing processes such as injection molding , heating and gluing , and the like . those of skill in the art will be familiar with such processes . fig4 illustrates a sole , or alternatively an insole , that is at least partially worn such that portions of a first external layer covering areas of the heel and ball of the foot have worn away . the wear pattern exposes an underlying layer that is represented by the star ( ) in the heel and text in the ball of the foot and that comprises a graphic image , a symbol , or text that conveys information . the underlying layer that is exposed may include any type , style , color , pattern , image , or combination thereof that conveys information . fig5 - 8 describe different methods of making insoles and soles of the invention . specifically , fig5 a shows a first liquid 23 ( light grey ) that will form a first layer being poured into a mold 24 . fig5 b shows a second liquid 26 ( medium grey ) that will form a second layer being poured into the mold 24 on top of the first layer 25 . fig5 c shows a third liquid 27 ( dark grey ) that will form a third layer being poured on top of the second layer 28 . fig5 d shows three layers 25 , 28 , 29 in the mold 28 . fig5 e shows the solidified insole or sole 30 removed from the mold 24 . preferably , each layer is allowed to solidify sufficiently before the next layer is poured to prevent disruptive admixing between the layers that would obscure the information that is to be conveyed through the use of the invention . those of skill in the art will appreciate that , as desired , additional layers can be added . fig6 illustrates the use of multiple molds to make a sole or insole having an underlying layer that comprises text , symbols , or graphics . specifically , fig6 a and 6b show a view from above and the side , respectively , of a first removable mold 32 and a second removable mold 33 . fig6 c shows a first liquid 34 ( light grey ) that will form a first layer being poured into a mold 31 . fig6 d illustrates the first removable mold 32 and second removable mold 33 placed on top of the first layer 35 such that portions of the surface of the first layer 35 are covered . fig6 e shows a second liquid 36 ( medium grey ), which is suitable for forming a second layer , being poured on top of the first layer 35 . fig6 f shows a second layer 36 formed on top of the first layer 35 . the second layer 36 is not present in the areas that were covered by the first removable mold 32 and the second removable mold 33 . fig6 g shows a third liquid 37 ( dark grey ) being poured on top of the first layer 35 and the second layer 36 after the first removable mold 32 and second removable mold 33 have been removed . fig6 h shows a multi - layered insole or sole in the mold 31 having the third layer 38 in contact with both the first layer 35 and the second layer 36 . those of skill in the art will appreciate that , as desired , additional layers can be added . fig7 shows an alternative method of forming a sole or insole . specifically , fig7 a shows a first liquid 39 ( dark grey ) that will form a first layer being poured into a contoured mold 40 . fig7 b shows a contoured layer 41 in the contoured mold 40 , and fig7 c shows the contoured layer 41 removed from the contoured mold 40 . fig7 d illustrates the contoured layer 41 being placed on top of a multi - layered bottom portion 43 ( lighter greys ), which has been formed in a separate mold 42 , that is sufficiently malleable to allow the two to adhere or bond to each other and form an insole or sole having multiple layers of differing thicknesses . fig8 illustrates forming compositions of the invention by using pressure . specifically , fig8 a shows a first preformed layer 45 , a second preformed layer 46 that has two gaps , and a third preformed layer 47 , 48 , which comprises more than one type of information such as a graphic 47 and a text message 48 , being placed into a pressure mold 44 . fig8 b and 8c illustrate the pressure mold 44 in operation to compress the layers together such that they bond together to form a composition of the invention 49 ( i . e . a sole or insole ) having layers of differing thicknesses . those of skill in the art will recognize that pressure may be used in combination with heat , solvents , various adhesives , or other materials suitable for promoting the different layers to bond together such that they are not readily separated from each other by a means other than friction . unless defined otherwise , all technical and scientific terms used herein have the same meaning as is commonly understood by one of skill in the art to which this invention belongs at the time of filing . the meaning and scope of terms should be clear ; however , in the event of any latent ambiguity , definitions provided herein take precedent over any dictionary or extrinsic definition . further , unless otherwise required by context , singular terms shall include pluralities and plural terms shall include the singular . herein , the use of “ or ” means “ and / or ” unless stated otherwise . furthermore , the use of the term “ including ”, as well as other forms such as “ includes ” and “ included ” is not limiting . any patents and publications referred to herein are incorporated by reference . all of the compositions and methods disclosed and claimed herein can be made and executed without undue experimentation in light of the present disclosure . while the compositions and methods of this invention have been described in terms of preferred embodiments , it will be apparent to those of skill in the art that variations may be applied to the compositions and methods and in the steps or in the sequence of steps of the method described herein without departing from the concept , spirit and scope of the invention .
the present invention provides footwear sole systems and methods of making the footwear sole systems . the footwear sole systems comprise soles or insoles that are designed to provide an easy and simple means of measuring the wear of footwear and of providing other information , such as motivational messages , to a user .