| 摘要 |
PROBLEM TO BE SOLVED: To improve flexibility of a front foot part of a shoe, and to lighten the shoe. SOLUTION: This sole structure has an upper midsole 3 extendedly provided from a heel part A of the shoe to the front foot part C through a middle foot part B; a lower midsole 5 disposed below a heel portion of the upper midsole 3; a first corrugated sheet 4a extendedly provided from the heel portion of the upper midsole 3 to a middle foot portion and sandwiched between the upper and lower midsoles 3, 5; and a second corrugated sheet 4b extendedly provided from a front foot portion of the upper midsole 3 to the middle foot portion and installed to the lower face of the front foot portion of the upper midsole 3. In the middle foot portion of the upper midsole 3, the first and second corrugated sheets 4a, 4b are overlapped at a prescribed vertical interval. Flexural rigidity of the middle foot portion of the upper midsole 3 can be increased, and flexibility of the middle foot portion can be reduced. Thereby, flexibility of the front foot portion of the upper midsole 3 can be improved to improve the flexibility of the front foot part C of the shoe.
|
