PRO EARS ReVO Electronic Ear Muffs - NRR 25 Skulls 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 differen