2 sets remaining "Hokkairo" refers to Kowa's brand of body warmers. Expiration Date: 2026.04 *The expiration date of the body warmer refers to "the period during which the specified temperature standards are guaranteed," not the "period during which the product can be used." Please use with confidence. This is stated on the official website. Made in Japan Kowa Size: 70mm x 90mm This is a set of 30 packs, each containing 2 warmers. It's easy to understand if you think of it as a 30-day supply. This is the "insert in shoes" type!!! Maximum temperature: 41°C Average temperature: 35°C Maintains a stable temperature for 7 hours! Excellent heat retention, providing warmth anytime, anywhere. Thin and non-slip. Will be shipped in a Nekopos box and delivered to your mailbox.