Pro Ears ReVO Electronic Ear Muffs are designed for smaller heads and ears. These NRR 25 electronic ear muffs are designed from the ground up to fit smaller heads. All the same features you expect from Pro Ears electronic hearing protection but they provide a better fit for children and smaller adults-this means better hearing protection. Everyone?s head and ear size is different. One size does not fit all and Pro Ears ReVO can make the difference for you! The ReVO Advantage is the great comfort and noise attenuation designed for a proper fit on youth and smaller adult heads. When total situational awareness is not required a great pair of electronic ear muffs are the most effective means to protect your hearing. A comfortable well designed pair of ear muffs can protect your hearing for years. Proper fitting is essential to adequate protection.