Sized for children over 8 years of age --- Most headphones don't fit children comfortably. The MDR-222KD headphones were designed with a child's head in mind. This allows the child to comfortably wear the headphones without strain that full sized headphones might cause as well as fit that eliminates the need to constantly adjust the headphones. Low volume --- By increasing the impedance on the headphones we have taken into account the sensitive nature of children¿s ears to try to eliminate volume issues that full sized earphones might cause. Lightweight --- By sizing these headphones correctly your child can use these headphones on long trips very comfortably.