Pro Ears ReVO(TM) passive earmuffs were designed from the ground up for smaller heads and ears. The ReVO contain the all of the same features you expect from Pro Ears hearing protection, but they provide a snugger fit for children and smaller adults-this means better hearing protection. The ear pads are specially shaped to eliminate gaps in the seal around the ear near the jawline on smaller heads. Children of all ages can benefit from the complete hearing protection these ear muffs provide, and you can be safe in the knowledge that their ears are protected no matter what