US Patent 7559158 Enhanced construction of inflatable inserts for articles of footwear

An improved method of providing direct contact of inflated inserts to user's feet, comprising the steps of modifying present manufacturing procedures and components of shoe construction. The shoe last is modified to accept inflated inserts that would not normally be allowed. The modified shoe last can be returned to its original shape by inserting the matching plugs and return to its normal function. The characteristics of the function of the inflated inserts can be designed to provide support and cushioning per sport or activity specific requirements. By modifying the lasting board, out sole and sock liner, (stiffer, stronger, more flexible materials) to maximize the design intent of the inflatable inserts.