Hokkairo refers to Kowa's brand of body warmers. Use-by date: 2026.04 ※ The expiration date of the body warmer refers to "the period during which the temperature standards indicated 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. You can simply think of it as a 30-day supply. This is the "in-shoe" 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. Shipped in a Nekopos box and delivered to your mailbox.