Features: brand new and high quality For the field work, mountain camping, polar expeditions, winter tourism, skiing, fishing and other outdoor sports to provide warmth for protection. This product can provide heat continuously to the body, with some relieving rheumatism and cold, has medicinal effects swelling pain. Thin and long enough for keeping entire foot warm. Clean and natural heat. React with air adequately is OK. It will stay in shoes flatly. Safe to use. Friendly and natural materials without peculiar smell. Care of your feet with FOOT WARMER. Heating for time Lasting up to 8-10 hours, Average temperature 40C. Suitable for the people who hates cold weather, dysmenorrhea along with cold feet. Specification: Heating time: 8 hours Average temperature: 52 Ingredients: iron powder, salt, activated carbon, water, etc. SIZE:9*7cm(for cm) Color: As pictures shown. Quantity: 5 pair(10pcs) Note: 1. Product should affixed to the outside of socks, do not directly attached to the skin. 2. Please be careful low-temperature burns.long-time body heat will produce erythema, blisters and other symptoms. Do not use it while sleeping at night. 3. Pregnant women and diabetic patients and blocked the blood circulation is required to use under the guidance of a doctor. 4. Children, the disabled or sensitive skin should use more attention in the low-temperature burns happen. 5. Please keep products, to avoid plastic packaging products, vacuum bags injury or damage, or product will fail. 6. Products in a dry, dark place to preserve. Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 5 pair(10pcs)x Foot Warmer Sticker(other accessories demo in the picture is not included.)