Heat brings increased blood circulation to an affected area. Cold threatment actually expedites the natural recovery Hot/Cold spa kit ApplicationCold compress: headache, fever, toothache, sunstroke, scald, muscle scuffing, sprain, trauma haemostasis, beauty etc.Hot compress: arthritis, rheumatism, menorrhalgia, stomach trouble, cervical vertebra trouble, sciatica, and strain of lumbar muscles etc ...