Specifications:Self-heating magnetic shoe insoles, canburn fat and accelerate metabolism, makes your body more perfect.It not only can keep your feet warm, but also massage your feet to ease fatigue.Made of cotton and cloth material, breathable, soft and comfortable to wear.Item Name: InsolesBottom Material: CottonSurface Material:Self-heating ClothGender: UnisexSuitable Size: 36-45Feature: Self-heating, Ease Fatigue, Magnetic, Comfortable to WearThickness: 6mm/0.24"(Approx.)Shoes EU US UK China(cm) 36 6 4 36 (23cm) 37 6.5 4.5 37( 23.5cm) 38 7.5 5.5 38 (24cm) 39 8.5 6.5 39 (24.5cm) 40 9 7 40 (25cm) 41 10 8 41 (25.5cm) 42 11 9 42 (26cm) 43 12 10 43 (26.5cm) 44 10 9.5 44 (27cm) 45 11 10.5 45 (27.5cm)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 Pair of Insoles