Describe: 100% new and high quality Material: super soft velvet Color: See picture Size: Female is about 23cm/9.1in long; Male length about 25cm/9.8in Package Includes:1Pair Self Heating Insoles The innovative thermal energy technology of the foot warmer patch, high-purity reduced iron powder, and honeycomb temperature locking structure provide a hot compress experience of up to 10 hours. 3mm gold thickness, light, soft and non-irritating to the feet, one-piece molding, ultra-thin design, comfortable to walk on. Large area heat dissipation, heat the entire sole of the foot, wrap-around heating, the heating area is increased by 90%, and the surface of the insole evenly dissipates heat to the entire sole of the foot. Grade A non-woven fabric is skin-friendly, non-irritating, hypoallergenic, breathable and does not leak powder. The hypoallergenic rate is as high as 99.99%. High-purity reduced iron powder heats quickly in 5 seconds without waiting. It only takes 5 seconds to warm your feet. It heats up immediately after removing it. It heats up quickly and the heating speed is increased by 90%. Note: 1. Please allow 5-10mm differences due to manual measurement, thanks. 2. The actual color of the product may be slightly different from the picture, and the website is caused by various factors such as the brightness of the monitor and the brightness of the light.