the invention will now be described in conjunction with the drawings , beginning with fig1 which shows a rigid outer boot 1 having a front tongue and cuff member 3 and a rear ankle and cuff member 5 . either cuff member 3 or 5 , or both , should be pivotably mounted to rigid footbed member 7 for facilitating insertion and removal of an inner shoe , as will be described below . any pivoting fastener 9 such as a nut and bolt assembly or a rivet may be used to secure the cuff members to the footbed . while a fixed rear cuff is shown in solid lines and described hereinafter , the rear cuff may be optionally pivotable to position 5a as further shown in fig1 . in this case , the footbed is truncated along line 13 . for reference , the outer boot is shown mounted upon ski 15 with bindings 17 . any conventional latching arrangement may be used to secure the cuff members together . for the purpose of illustration , adjustable buckles 19 are shown fixed to the rear cuff with mating hasp members 21 fixed to the front cuff . a rigid footbed and integral rear cuff member are seen in fig2 . longitudinally spaced along the inner portion of the footbed are a plurality of mounting recesses or cavities 23 . preferably , the cavities are generally arcuate in form and define spheroidal or egg - shaped surfaces . the footbed may be molded of rigid plastic material and the mounting cavities may be formed during molding . as further seen in fig3 the recesses , preferably 4 in number , are substantially symmetrically disposed such that a first pair of opposed recesses are provided adjacent the skier &# 39 ; s heel and a second pair of opposed recesses are provided adjacent the ball of the skier &# 39 ; s foot . a sport shoe 25 is shown in fig4 for use with the outer boot 1 . the shoe is formed with a soft , pliable and easily flexed upper portion 27 and relatively stiff sole portion 29 . both the upper and lower portions of the sport shoe are preferably formed of plastic materials , although the upper portion may be formed of leather or fabric , if desired . although optional , reinforcing support plates may be provided on the shoe for additional sole and heel support . sole plate 31 and heel plate 33 may be blanked from sheet metal and bonded or fastened to the sole as shown . since it is important to leave the arch section 35 as flexible as possible to facilitate walking , the support plates should not extend through this region . bulbous or egg - shaped projections 37 , 39 are shown in fig4 and 5 extending laterally from sole 29 . the projections are somewhat spheroid - shaped to substantially complement the form of the recesses 23 . the generally arcuate shape of the recesses and projections serves to guide the shoe to its correct mounting position within the boot and further acts to self - center the shoe therein . a particularly useful feature is the formation of a series of holes 41 within the front end of sole 29 and plate 31 . the holes are dimensioned to mate with projecting pins common to most standard cross - country ski bindings so that the inner shoe may be alternately used for cross - country skiing . of course , any other type of cross - country fitting may be used on the shoe such as a metal loop projecting from the tip of the shoe . the holes 41 are further seen in fig6 which also shows in more detail the front projections 37 and front plate 31 . for clarity , fig7 and 8 respectively show sections taken through the rear projections 39 and the arch region 29 . the relative alignment of the inner shoe within the outer boot is shown in fig9 through 12 . fig9 reveals a spongelike cushion 43 removably fastened to the inner wall of the front cuff 3 by intermeshing hooked fabric fastening strips 45 or any other suitable removable fastener such as a snap fastener . cushion 43 may be inserted or removed as needed to adjust the fit of the shoe within the boot . additional optional padding may be similarly provided along the rear cuff as shown in fig2 . these cushions provide any level of desired pressure between the boot and shoe and ensure a substantially rigid inelastic connection between the projections and recesses . as best seen in fig1 through 12 , the sole 29 of the inner shoe is actually suspended above the floor of the footbed so as to define a continuous chamber 47 therebetween . chamber 47 is intended to prevent interference between the boot and shoe caused by debris such as snow and ice which may become caked on the sole of the shoe . it can be further appreciated that the mounting and suspension system provides support at four points . although spheroidal recesses and projections are preferred , any shape of complementary recesses and projections can be used . these would include orthogonal projections and recesses such as cubic shapes , or even cylindrical or trapezoidal - shaped mating surfaces . a particular advantage of the present shoe and boot system is the ability to fit various - sized shoes within the same outer boot . one manner of carrying this out is shown in fig1 wherein a small shoe is shown in solid lines and two successively larger - sized shoes are shown in phantom . it is important to note that the spacing between the front and rear projections 37 , 39 is kept constant for each shoe so that any one of the shoes will fit within the same boot such as seen in fig9 . the boot must be dimensioned to provide the necessary longitudinal clearance for the largest shoe expected to be mounted therein . cushions 43 may then be used to adjust the fit of each shoe within the boot , if necessary . another approach to mounting various - sized shoes within the same boot is shown in fig1 through 19 wherein easily removable mounting platforms 49 are provided with registration keys 51 . the keys are longitudinally spaced apart a fixed distance k for locking the platform into corresponding cavities 53 formed in the bottom of footbed 7 . each platform is also formed with recesses 23 longitudinally spaced apart a distance a , b , c , etc ., depending upon the size of shoe to be fitted within the boot . shoe 25 would in this case then have projections 37 , 39 spaced apart a distance a , b , or c depending on the size of the shoe so that each shoe would have spaced projections complementing the location of the recesses formed in one of the platforms . a cavity such as cavity 47 shown in fig1 through 12 can be easily designed into this arrangement as well . this suspension and mounting arrangement allows the custom placement of the projections and extensions to optimize system performance and comfort . as noted above , the connections between the recesses and projections is quite rigid and inelastic to further promote performance . it can be appreciated that the ski boot system described herein offers convenience and comfort not available with conventional ski boots . the inner shoe is primarily designed as a stylish walking shoe which can be quickly and easily released from the outer boot while leaving the outer boot bound to a ski . obviously , numerous modifications and variations of the present invention are possible in light of the above teachings . it is therefore to be understood that within the scope of the appended claims , the invention may be practiced otherwise than as specifically described herein . for example , the sport shoe may be provided with the mounting recesses and the boot provided with the corresponding mounting projections .
a ski boot system includes a rigid outer boot having contoured support surfaces for supporting and suspending any one of a plurality of varying sized pliable inner sport shoes . the inner sport shoe is provided with rigid engagement surfaces formed to complement the support surfaces of the outer boot . in this manner , a relatively inelastic and rigid connection is provided to positively secure the shoes within the boot .