... first then move to microwave for no longer than one minute at full power.--Hot use by hot water: Bring 3 quarts of ... usage: Lay the gel pack flat in freezer for at least two hours.--hot compress: alleviate rheumatic pain, neural pain, sciatica, ... hemorrhage, heatstroke, itch, headache, strain, scald and fatigue--Medical available for hot or cold compress easily and conveniently, necessary as a first ...