Inner Material
Skin-Friendly Texture: The interior is finished with a smooth, matte texture to prevent chafing or "hot spots" when wearing them barefoot.
Breathability: The circular perforations (holes) on the upper allow air to circulate inside the shoe, preventing the "sweaty" feeling often associated with synthetic materials.
Odor Resistance: Since the inner material is non-porous (closed-cell), it doesn't soak up sweat or harbor bacteria. This keeps them from smelling as bad as cloth-lined shoes over time.