If you've ever suffered from dark under eye circles then you've probably tried countless under eye masks and treatments. All claim to brighten and tighten and while I haven't tried every mask under the sun, I have tried quite a few, and none have compared to the VII code 8 hour oxygen under eye mask. The first difference I noticed right away was that although these look like ordinary sheet masks, they actually have a thick gel texture on one side that is both soothing and cooling. The second difference I noticed to traditional sheet masks was that this mask is an 8 hour overnight treatment, so you sleep with it on and wake up with a brighter under eye area. The gel sticks to the surface of your skin so they stay in place comfortably while you sleep. The box comes with 5 masks and you wear them 2 to 3 times a week. 3 boxes is a full treatment cycle. These masks really work and once I completed a treatment cycle I noticed my under eye area was much brighter. I've only been through one treatment cycle but I can honestly say these eye masks worked wonders. You can order these online at http://www.viicode.com/index.php/oxygen-eye-mask/ or search their site for other great products at http://www.viicode.com.