THERMOGEL HOT-COLD GEL Description Reusable gelatin sachet suitable for cold and hot use. Cold: suitable for bruises, sprains, trauma, hyperthermia and in all cases where cryotherapy and the use of cold are required. Hot: lumbago, stiff neck, rheumatism, hypothermia and in all cases where the application of heat is required. Directions for use Cold: place in the freezer for at least two hours. Remove, insert the sachet into the appropriate pocket or cloth and apply to the affected area