It's hot in them if you sit for a long time. I use it for 4 hours a day, at an ambient temperature of +28, it's so hot. When the temperature around is lower, then normal. The charge lasts 10 hours. Noise canceling is just divine! I can’t say anything about the sound quality, because I don’t understand this :) I got it In size: quite compact, but the ears are completely closed. For comparison, the photo shows a bottle of 0.5 water.