These made-in-Japan thermo patches create a blissfully warming, moisturizing temperature of 40 degrees Celsius (100 degrees Fahrenheit) - the same warmth as a nice hot bath. The heat relaxes your tired or sore muscles and, by extension, your whole being, for a full 30 minutes or more.
For more details, see the official Kao website:
http://www.kao.co.jp/megrhythm/night/en/
Steam eyemasks are also available: Unscented, Yuzu Aroma, Chamomile & Ginger Aroma, Lavender & Sage Aroma, and Menthol.