1Made of quality material, which is breathable, soft and comfortable to wear. 2Fan-shaped air hole design, prevent foot bacterial infection, sweat and ventilation. 3Arch support, relieve foot pressure, correct flatfoot to beautify walking posture. 4Ergonomic design will support heel and prevent strephexopodia to reduce pain. 5Suitable for most kinds of shoes, and various sizes can meet your different need.