U.S. Buyer Note:The areas where the U.S. warehouse does not deliver goods are: Hawaii, Alaska, Puerto Rico, Guam, and other U.S. overseas territories. And a military address. But you can choose to ship from China. Spanish buyer note:If your address contains the following zip code, please do not select Spanish warehouse. The zip code starts from 35/38.Overseas warehouse cannot be delivered. But you can choose to ship from china1 Pair Unisex USB Electric Heated Insoles Winter Comfortable Foot Keeping Warm Washable Outdoor Sports Thermal Shoe Insoles MatFeature:Suitable for any kind of shoes, washable. Small sun inside the shoes-warm feet and warm shoes-keep warm all winterFar infrared ray, releases infrared ray at almost the same frequency as the far infrared frequency of the human body.10 seconds temperature sensor, ultra-high thermal conductivity 10 seconds ultra-fast temperature sensor. Warm but not dry, carbon fiber heating hot but not dry. Carbon fiber heating material, using high quality heating wire, high heating temperature, long service life. Five layers of material insulation energy saving, fast heating, hot but not dry. Specification:Name: UBS Thermal InsertsTop Material: Extra Soft VelvetVoltage: 5V/2A Temperature Material: EVA Weight: 0.13kgTemperature: 40-50 Degree (Depends on Environment)Size: 35-36:23cm/9.06in,37-38:24c