Cuts out all light and is very comfortable on my face. It received 4 stars and not because it does retain heat and gets warm. The warm face is very acceptable and I would buy this again if I needed to. This was bought when I worked nights and slept during the day. No worries about letting light in the windows and creating a dark room with these on. My wife liked them because she could still have light in the bed room if she needed to get anything while I slept.