Description:Premium fabric makes it breathable and sweat absorbing. Density particles design brings 24 hours circulation heating to massage feet and improve foot colds.High elasticity and nanometer heating particles design makes it comfortable. Wormwood ingredient design helps warm the meridian, dispel dampness and dispel cold.Made of high quality spandex, cotton and polyester material, it is comfortable.The length of the product is 28cm, the width is 10cm.It is suitable for home, outdoor and so on.Item Name: Self Heating SocksMaterial: Polyester,Cotton,SpandexGender: UnisexSeason: Four SeasonColors: Black, White, Red Tube Height: Middle TubeApplicable Age: 18-40 Years OldFeatures: Self-Heating, Soft, ComfortableSize Details: Size: 28cm x 10cm/11.02" x 3.94" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.If the heat energy cannot be released due to long use time or improper maintenance, please put the heating socks in the sun to recover.Heating socks need to be washed by hand, fast washing, and can not be soaked in water for a long time (to prevent damage to heating spots). It can be washed with alkaline soap.Package Includes:1 Pair of Self Heating Socks