Onpax Foot Warmer Sheets for Insoles, 25cm, 3 pairs x 20 sets Expiration Date: April 2027 Product Description: ● Simply place them in your shoes to warm up cold feet. ● The left and right shapes are designed to fit your feet, warming your entire foot. ● Thin and comfortable, making it easy to walk. ● Available in two sizes, 22cm and 25cm, and lasts for 8 hours. ● Mineral-based absorbent and antibacterial non-woven fabric suppress odors in shoes. ● Contains antibacterial and deodorant agents, suitable for boots and sneakers. ● Color: Beige ● Heat starts when the package is opened. ● Maximum temperature: 39°C ● Average temperature: 35°C ● Duration: 8 hours (measured assuming use inside shoes) *The displayed temperature and duration are measured assuming use inside shoes. There may be slight variations depending on the user's environment (temperature, type of shoes, etc.).