correspond to the number of shoestring tension ropes 41 which extend through the through holes 411 421 said action and adjustment mechanism 5 has a shuttle piece 51 which is slidably mounted in the space 40 between the two tying pieces 41 42 a side end of the shuttle piece 51 has a rope guiding slot 511 provided for tension ropes 31 of each shoestring 3 to extend through after passing through holes 411 421 in a parallel manner as shuttle piece moves forward each tension rope 31 is tensioned in sequence and the shoestrings 3 are pulled tight inwardly to tie the vamp tightly the upper end of the shuttle piece 51 has at least one retaining slot 52 provided for retaining the arm 53 in different retaining positions to change the height of the arm 53 and sliding length of the shuttle piece 51 fig9 to change the inward tensioned length of the shoestring 3 and therefore to change the tightness of the shoe the setting and adjustment can be determined subject to feet size of the user and regardless of the user 39 s feet width proper tightness can be achieved said arm 53 comprises of two arm rods 531 532 movably attached by means of a shaft assembly a distal end of arm rod 531 forts a retaining rod.