Flex-Phones Indestructible Foam Headphones. HamiltonBuhl Flex-Phones™ are nearly indestructible, made from a single piece of EVA foam. EVA foam is safe, non-toxic, BPA-free, soft and an extremely flexible material. Recommended for children ages 3 and up, Flex-Phones deliver high quality sound that will never exceed 85 decibels, ensuring young developing ears are protected. | Hamiltonbuhl | | Flex-Phones, Foam Headphones, Red | Best Buy