Designed to provide safe and effective moist heat for pain relief or therapy for sore, stiff muscles and joints. Provides up to 30 minutes of soothing moist heat that can improve blood circulation, reduce inflammation and increase flexibility. Reusable design for numerous effective and economical treatments for professional or home use. Immerse in hot water or heating unit. Use with Pro Advantage all terry or foam filled terry covers. Several sizes available to adapt to the contours of the body. Constructed of a synthetic fabric and filled with bentonite.