Description: This USB heated shoe insert can evenly heat and keep your foot warm. The heating shoe insole is washable, can be washed by water, keep the interface away from water. The warm shoe insert is suitable for many kinds of shoes, such as sneakers, flat heel shoes, boots, and so on. The winter shoe insole can be powered by USB, so you can use power bank to power it. The shoe insole is trimmable, you can trim it to meet your different needs. Specification:Material: EVA. Heating material: Far infrared carbon fiber. Color: Black.Size: 35#-39#, 40#-44#. Temperature: 40-50°C.Note:There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package included:1x Shoe insole.1x USB cable.1x User manual.