Cura heat arthritis pain refill packs are air activated heat packs designed for use in either the knee or wrist elasticated wrap of the cura heat arthritis pain products once inserted into either the knee or wrist elasticated wrap they deliver deep comforting heat for up to 8 hours and provide targeted temporary relief to arthritis pain with no need for preparation just open the sachet and insert the heat pack into either the knee or wrist wrap pockets the comforting heat can help relieve t