説明These japanese-made sandals are crafted from four types of materials, designed for wellness while walking. The "marshmallow®" insole material is a specially formulated rubber that absorbs shock and provides rebound. The footbed conforms to the wearer's foot shape, promoting toe movement and strengthening the arch. Note that the surface of the "marshmallow®" footbed may show wear over time, which is a sign of proper foot usage and does not affect material performance.