Natural & Longer Heat Moist Therapy: Filled with flaxseeds, millet and claybeads, the microwavable heating mittens for hand and fingers provide at least 20 mins soothing heat therapy in microwave 90 sec . Heat therapy helps to relax sore muscles and improve flexibility and range of motion. As hand warmer arthritis, it also perfect for warming cold hands, an excellent idea to bring warmth and love.