... used as hot and cold compress.1. Usage: both hot and cold use 1) Hot use by microwave: Place ... than one minute at full power.2) Hot use by hot water: Bring 3 quarts of water to ... flat in freezer for at least two hours.4) hot compress: alleviate rheumatic pain, neural pain, sciatica, ... headache, strain, scald and fatigue6) Medical available for hot or cold compress easily and conveniently, necessary as a ...