fig3 and 8 conforming to and engaging base surface 42 the cursor has an outermost surface 48 opposite inner surface 46 which is wholly located within the periphery of the groove as defined by the outer surfaces of the cuff portion and the boot portion in this manner the cursor does not extend outside of the groove and is shielded by the cuff and boot portions the flexure characteristics of the boot are varied by locating cursor 44 in different positions within groove 36 the higher the cursor is moved within the groove the greater the resistance to flexing conversally the lower the cursor is moved within the groove i e towards journals 32 the less is the resistance to flexing cursor 44 is provided generally on the in step portion of the ski boot a second cursor 50 see fig2 is located on the outer portion of the ski boot since the two cursors are essentially identical only one will be described in detail since the description of one will also apply to the other support member 38 includes a generally vertical edge surface 52 defining one side of the groove this edge surface comprises a plurality of recesses 54 which define various discrete positions for the cursor along the groove the opposite side of the groove defined by support member 40 includes a bar member 56 terminating short of the lower end 58 of groove 36 in this manner an enlarged lower end of the groove is provided which lower end is defined between the cuff portion 22 and.