Hand Warmer, Body Wamer, Knee Warmer manufacturer / supplier in China, offering 8hours Long Duration Disposable Heat Foot Warmer Insole Pad Sticker for Winter Sports Enthusiasts, 8-Hour Portable Heat Warmer Insole Patch for Foot & Toes - Stay Warm All Day Long, Self-Heating Foot Insole Warmer Patch Pad Sticker - 8hours Long-Lasting Comfort for Outdoors and so on.