PVC material, safe and odorless, water injection design. Heat preservation and cold protection, anti-scald and leak-proof, can warm hands, abdomen, waist and so on. The unique craft design captures the hearts of girls. A variety of styles are available, and it can be used directly after adding hot water. Hot and cold, to meet your various needs, a good companion for sleep in winter, office heating. In case of fever, sports sprain, it can be used as an ice pack to cool down with cold compress.