Onpax Socks-Use Adhesive Body Warmers Black, 5 Pairs [Made in Japan / 9-hour duration] 【Thin, Non-Slip, Warms Up Well】 Simply stick them to the toes of your socks to warm your feet effectively. 【Choose According to Your Socks' Color】 This color is black. Deodorizing effect suppresses odors inside your shoes. 【Uses】 Disposable body warmer, shoe-specific (adhesive type for socks) 【Specifications】 Maximum temperature: 43°C, Average temperature: 36°C, Duration: 9 hours (measured assuming use inside shoes) 【Country of Origin】Japan 【Contents】5 pairs 【Size】9.5cm x 7cm