The term PART OF SHOE can be broken down into two crossword solutions: HEEL (4 letters) and INSOLE (6 letters). The HEEL is the back part of a shoe, usually made of a harder material than the rest of the shoe. It is designed to provide support and stability when walking. The insole is the inner sole of the shoe, which provides cushioning and comfort for the foot. It is usually made of a softer material than the outer sole.