Product Name: Magnetic Massage Insole (22 magnetically ventilated arch) Material: knitted fabric + new breathable cotton Specifications: S 35-40 (25CM), L 41-48 (29CM), tailoring. Thickness: Total thickness 6 mm. Weight: Small size 72g, large size 88g. Number of magnets: A pair of insole contains 22 magnets. Insole features: 1: New breathable material, soft and comfortable, all-round sweat absorption. 2:22 magnet design, corresponding to the position of acupoints on the sole of the feet (including insomnia point reproductive point liver kidney heart trachea intestine lung) 3: arch support +3D side arch can be flanged design, all-round care of the arch, improve the wrong force on the sole, relieve the pain of flat foot pressure 4: The heel bottom protruding design, buffer the pressure of the heel during running, higher comfort, better shock absorption effect. 5: Size code 2 specifications optional, cutting line design, easy to use, suitable for many types of shoes.