Material: Bomull + KolfiberSvart f?rgUppv?rmningstemperatur: About 50°CHelt ny och h?g kvalitet.Uppv?rmningsomr?de: TillbakaBattery type: 3 AA batteries (eng?r ej)Multi-function: Hiking, skiing, climbing and outdoor activities.The case: Focus on? the toes to prevent the feet from getting cold, which can promote blood circulation.Premium material: Made of cotton and fiber material, which is absorbent, breathable, quick drying and elastic.The package contains: 1 pair of thermal socks (no battery)Note:This product does not contain a batteryAllow 1-3 cm measurement deviation depending on manual measurement.