I bought these for my family member, but they won't use them because they don't want them to be visible when they take their shoes off, so I'm selling them. The left one, from Iris Ohyama, is new and unopened, and the right one is partially used, so it's a bonus (2 sets remaining). - Quantity: 5 pieces per pack - Type: Black type - Features: 2-WAY, stick-on type - Duration: 8 hours - Size: For feet Expiration Dates: Iris Ohyama: 2027.6 Partially used one: 2026.8 Socks warmer Stick-on type Thank you for looking.