... .(nylon) PVC 2.size:31*18cm 3.for both cold and hot use,keep soft at - ... microwave oven to be warmed for 100 seconds for each time, and for 60 seconds when be used ... continuously.2.Purpose: Cold compress: physical therapy for traumatic hemorrhage, heatstroke, itch, headache, strain, scald, ... conditions, and can be repeatedly used alternately for hot and for cold. Non toxic. Non-caustic. Reusable ...