Kiribai Kairo 9-hour duration Disposable foot warmer for socks x 3 pairs + 1 bonus pair Perfect for cold weather対策 (measures). This new, unopened item was purchased around December of last year, and the expiration date is April 2027. The bonus pair was purchased around December of the year before last. Please note that when shipping, the outer bag will be folded to remove excess space, excluding the warmers themselves.