Reusable gel cushion type pad is specially designed to provide a gradual release of heat or cold to aid in recovery from discomfort or pain. Heat therapy helps relieve muscle tension, so it is very effective in cases of low back pain, sciatica, joint stiffness or muscular and rheumatic pain, and cold therapy helps block inflammation, so it helps in cases of mild bruises and acute trauma, muscle sprains and strains, burns, bleeding, skin infections, insect bites, headaches and toothaches.