Onpax Socks-Use Adhesive Body Warmers Black, 5 Pairs [Made in Japan / Lasts 9 Hours] 【Thin, Doesn't Slip, Warms Up Thoroughly】 Simply stick them to the toes of your socks to warm your feet thoroughly. 【Choose According to Your Socks' Color】 This color is black. Deodorizing effect suppresses odors inside shoes. 【Uses】 Disposable body warmer, shoe-specific (type to stick on 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