This Hotteeze Heat Pad has been designed to offer a steady supply of heat to help increase blood flow and reduce pain in tired muscles and stiff joints.The lightweight compact design of the Hotteeze Heat Pad ensures it can be easily kept in a handbag or pocket so it can be ready to use on-the-go. Hotteeze Heat Pads offer a highly discreet method of pain relief, once the packet is opened, the fillings inside the pad react with oxygen to create constant heat for 12 hours.