ClickHeat neck and shoulder heat pack in vibrant purple. Ideal for soothing warmth. Arthritis - Efficient and Versatile Heat treatments, such as heat pads or warm baths, tend to work best for soothing stiff joints and tired muscles associated with arthritis. Heat is especially good for getting your body limber and ready for exercise or activity. Cold is best for acute pain, numbing painful areas and decreasing inflammation and swelling. Migraine - Effective Hot / Cold Therapy Technique Migraine pain has been described as one of the worst pains anyone can suffer. Treating a migraine as soon as it starts is key to keeping them from escalating into a full blown excruciating headache. Versatility is key, and the Relax style pad delivers. While it excels in targeting the shoulders and neck, it's equally effective on other areas of your body, including the upper and lower back, abdomen, arms, legs, and joints. It's like having a personal spa treatment wherever and whenever you need it. Experience the warmth for an extended period, as the approximate heating time is 30-45 minutes. Once the pad has given off all its heat, it gracefully transitions into a crystallized state until it's time for a recharge. The process is simple—place the pad in a pot of boiling water for 5 to 10 minutes (depending on the size) until all crystals are gone, and the pad returns to its original liquid state.