reference throughout this specification to “ one embodiment ,” “ an embodiment ,” or similar language means that a particular feature , structure , or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention . thus , appearances of the phrases “ in one embodiment ,” “ in an embodiment ,” and similar language throughout this specification may , but do not necessarily , all refer to the same embodiment . furthermore , the described features , structures , or characteristics of the invention may be combined in any suitable manner in one or more embodiments . in the following description , numerous specific details are provided to give a thorough understanding of embodiments of the invention . one skilled in the relevant art will recognize , however , that the invention may be practiced without one or more of the specific details , or with other methods , components , materials , and so forth . in other instances , well - known structures , materials , or operations are not shown or described in detail to avoid obscuring aspects of the invention . fig2 a depicts one embodiment of a flip - flop 200 in accordance with the present invention . the flip - flop 200 is similar to the flip - flop 100 illustrated in fig1 a - 1b ; however , a platform 210 includes a heel pad 212 angled to provide improved support to the heel of the wearer . in certain embodiments , the platform 210 is curved to anticipate the natural curvature and movement of the foot . the curved platform 210 , according to one embodiment , positions the heel pad 212 relative to the predicted heel contact area 128 . in certain embodiments , the center point 129 of the heel contact area 128 comprises the approximate geometric center point of the heel pad 212 . aligning the heel pad 212 with the heel contact area 128 enables the heel to have substantial support on all sides . in addition , the heel pad 212 wears more evenly as the inner edge 130 receives about equal wear as the outer edge 132 . accordingly , the heel contact area 128 wears longer than with a traditional heel pad 112 . as mentioned , the traditional heel pad 112 may be aligned with the natural curvature of the foot represented by angle 126 in fig1 a . in theory , the heel pad 112 should provide centralized support to the heel . however , the movement and shape of the foot as well as the retaining covering 114 affect where the heel actually contacts the platform 110 and 210 . in the depicted embodiments , the straps 114 exert uneven pressure on opposing sides of the foot . the inner strap 114 a typically exerts less pressure on the foot than the outer strap 114 b under certain conditions . in one embodiment , when the foot is pressed down against the platform 110 and generally aligned with the shape of the platform 110 , the outer strap 114 b retains the foot by providing tension against the corresponding side of the foot . in contrast , the inner strap 114 a under the same condition typically remains relatively loose . when the wearer lifts her foot , however , the tension generally shifts from the outer strap 114 b and becomes more balanced between the two straps 114 a and 114 b , causing the heel pad 112 of the platform 110 to swing outward . as the wearer steps down again , the tension of both straps 114 a and 114 b cause the heel to contact the platform in an offset position at about where the heel contact area 128 is outlined with a dotted line in fig1 b . altering the configuration of the straps 114 would alter the tension on the foot , but the problem of outward movement and uneven wear on the heel pad 112 would remain . referring back to fig2 a , rather than altering the straps 114 , the flip - flop in the depicted embodiment adjusts the heel pad 212 to mitigate the problem . as a result , the user experiences greater comfort and improved heel support . the heel pad 212 is aligned with the movement of the foot in conjunction with the flip - flop 200 . uneven wear and related pains are minimized and extraneous platform material may be eliminated . the intersection of the centerline 118 and a line 216 passing through the geometric center point 129 preferably creates a substantial angle 218 . the upper portion of the flip - flop 200 with the retaining covering 114 may function as described above . yet the curved platform 210 provides additional support to the heel when the wearer steps down on the platform 210 . the curvature of the heel pad 212 prevents the outer edge 220 from swinging past the heel of the foot in certain embodiments . the platform 210 and the heel pad 212 may or may not be a single unit . the heel pad 212 may be attached to the platform 210 in certain embodiments . in one embodiment , the heel pad 212 is personalized for the wearer and may be applied to an existing article of open - heeled footwear . the platform 210 may be altered to suit an individual wearer . in one embodiment , the superfluous platform material on the outer edge 132 may be removed and may be used to increase the support provided to the inner edge 130 , creating a substantial angle 218 . in another embodiment , additional material may be added to the inner edge 130 of an existing flip - flip 100 to increase the amount of support provided to the heel contact area 128 . in the depicted embodiment , the heel pad 212 curves at about where the retaining covering 114 contacts the platform at holes 116 b and 116 c . in certain embodiments , the curve or angle 218 is more severe than the natural curve of the foot illustrated in fig1 a , which is commonly emulated in footwear . fig2 b illustrates the improved flip - flop 200 relative to the traditional flip - flop 100 . the angle 222 may represent the amount of alteration of the curve 218 from the natural curve 126 of the foot illustrated in fig1 a . in certain embodiments , the curve 218 may be more severe than the natural curve of the foot by greater than 20 degrees with a preferred difference of about 30 degrees . fig3 illustrates an alternative embodiment of a backless sandal 300 with a platform 310 for receiving a foot , a heel pad 312 , a retaining covering 314 , contact points 316 , a centerline 318 , a midpoint 320 , and a geometric center point 322 , which may align with the center point 129 of the heel contact area 128 in certain embodiments . the retaining covering 314 and the contact points 316 may facilitate defining the centerline 318 , which approximately equally divides the area between the retaining covering 314 . in addition , the contact points 316 a and 316 b may define the midpoint 320 in certain embodiments . alternatively , the midpoint 320 may be located above or below the line 321 that passes through contact point 316 a and 316 b . the midpoint 320 may be defined by the centerline 318 and the intersection point of line 324 in one embodiment . in the depicted embodiment , the line 324 passes through the geometric center point 322 and defines the approximate centerline of the heel pad 312 . the heel pad 312 may be positioned relative to the heel contact area 128 as discussed above . in certain embodiments , the geometric center point 322 of the heel pad 312 and the center point 129 of the heel contact area may be encompassed within the heel contact area 128 and / or within a central area 326 of the heel pad 312 and are not necessarily directly aligned . those of skill in the art will recognize a benefit of the invention without precise alignment of well - defined points , such as the referenced geometric points 322 , 129 . thus a projected central area 326 containing the geometric center point 322 and the heel contact center point 129 is within the scope of the invention . the retaining covering 314 may comprise various shapes and forms as is known in the art . in the depicted embodiment , the retaining covering 314 comprises a single strap 314 connected to the platform 310 . the foot may slide and the platform 310 may shift as discussed above . a heel contact area 128 may be determined and the heel pad 312 may be adjusted to support the heel and to anticipate regular motion . fig4 illustrates an alternative embodiment of a backless sandal 400 . the sandal 400 as depicted includes a curved platform 410 , a heel pad 412 , a retaining covering 414 , contact points 416 , a centerline 418 , a midpoint 420 , and a geometric center point 422 . the retaining covering 414 , which comprises a toe strap 414 a and an angled strap 414 b , has an approximate centerline 418 that intersects with line 424 at about the midpoint 420 , creating a substantial angle 426 . the midpoint 420 may be relative to the main strap 414 b extending between contact point 416 a and 416 b in certain embodiments . alternatively , the midpoint 420 may be relative to the established centerline 418 and the platform 410 . the line 424 , in the depicted embodiment , defines a line passing through the determined midpoint 420 and the geometric center point 422 of the heel pad 412 . the depicted style of sandal 400 benefits from substantially aligning the heel pad 412 with the heel contact area 128 . the geometric center point 422 of the heel pad 412 consequently is located at a substantial angle from the center line 418 of the retaining covering 414 . the angled heel pad 412 provides greater comfort and support to the user . the schematic flow chart diagram that follows is generally set forth as a logical flow chart diagram . as such , the depicted order and labeled steps are indicative of one embodiment of the presented method . other steps and methods may be conceived that are equivalent in function , logic , or effect to one or more steps , or portions thereof , of the illustrated method . additionally , the format and symbols employed are provided to explain the logical steps of the method and are understood not to limit the scope of the method . although various arrow types and line types may be employed in the flow chart diagrams , they are understood not to limit the scope of the corresponding method . additionally , the order in which a particular method occurs may or may not strictly adhere to the order of the corresponding steps shown . fig5 illustrates one embodiment of a method 500 for providing open - heeled footwear with improved heel support . the method 500 begins 502 and includes providing 504 an article of foot apparel having a platform and a retaining covering , determining 506 an actual heel contact area , and substantially aligning 508 the heel pad with the center of the heel contact area . then the method 500 ends 510 . in certain embodiments , an article of open - heeled foot apparel may be customized to suit a particular foot and / or walking pattern . the heel pad may be aligned such that a substantial angle is created at the point of intersection of a line passing through the geometric center point of the heel pad and the center line of the retaining covering . the platform may be curved to anticipate the natural movement of the foot relative to the article of foot apparel . in certain embodiments , the heel pad may be attached to the platform in order to substantially align 508 the heel pad with the center point of a heel contact area . in another embodiment , a platform may be formed as a single unit with a heel pad substantially aligned 508 with a center point of a heel contact area . in one embodiment , a platform material may be attached to the platform to supplement the support of the existing heel pad . fig6 shows a further way of describing the curvature of the flip - flop 200 of the present invention . in this depiction , the intersection of the centerline 119 and the line 216 passing through the geometric center point 129 preferably creates a substantial angle 219 . in certain embodiments , the curve or angle 219 is more severe than the natural curve of the foot illustrated in fig1 a , which is commonly emulated in footwear . in certain embodiments , the curve 219 may be more severe than the natural curve of the foot by greater than 20 degrees . in one embodiment , the angle 219 is about 30 degrees . the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics . the described embodiments are to be considered in all respects only as illustrative and not restrictive . the scope of the invention is , therefore , indicated by the appended claims rather than by the foregoing description . all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope .