Kiribai Ashi Hotton for Sleeping Contents: 8 sheets (4 uses) x 10 packs Expiration date: 2026.04.30 Thermal sheet to be applied to the feet when sleeping. For those who suffer from cold feet to the point they can't fall asleep. Gently promotes blood circulation in the feet with heat of approximately 45°C (surface temperature of the thermal sheet). The thermal effect lasts for 6 hours (the time the product maintains a temperature of 40 degrees or higher). Please refrain from purchasing if you are sensitive. Instant purchase is OK. Feel free to comment if you have any questions.