Description/Function:Self heated insoles, magnetic heating foot massage insole warm shoe insole, keep your feet warm shoe cushion. Unboxing automatically generates heat, sticks to the soles of your feet, and then removes it after cooling. Maximum temperature up to 63 degrees Celsius, average temperature up to 53 degrees Celsius. Four layers of non-woven fabric, good breathability, safe and harmless, soft touch, more secure. According to the premise of temperature assurance, the heat is even and stable, and the heating time is longer. The heat starts at the soles of the feet. Specification: 1,100% Brand New & High Quality2, Material: Non-woven Fabric, Iron Powder, Breathable Membrane3, Size: About 22.5cm x 7cm, Heating Range: 21.5cm x 6cm4, Average Temperature: 53 Degree5, Packing Specification: 2pcs=1 SachetPackage Included: 1 Pair/SetNote: There is 2-3% difference according to manual measurement. Please check the measurement chart carefully before you buy the item. Please note that slight color difference should be acceptable due to the light and screen.