I hardly ever write reviews, but I love this heated eye mask! I suffer from severe dry eye and have tried many ways to do hot compresses. This mask doesn't get quite as hot as the microwave kind and it takes a minute or two for the warmth to start but the heat lasts for a good while. They slip easily into your purse and are great for travel (especially on airplanes where the air is exceptionally dry) or for a break in the middle of the day at work. I wear them when I'm lucky enough to find time to take a nap during the day, and I use them several nights a week when going to sleep. Often when I take them off after 20 min or so, there is moisture all around my eyes (to get the moisture effect, just put it on and keep it on....don't keep lifting it up). I also like how it has the little pieces that go around your ears to help keep the mask in place.