Professional-grade Thermo-Active Hot Gel is applied to the joints that need it most: shoulders, elbows, knees, lower back, outer hips, feet, and ankles. Then you rest while deep infrared warmth drives those active ingredients even further into the joint capsules, tendons, and connective tissue. By the time you rise from the blanket, your body is at peak pliability and your nervous system is as calm as it can be.