Baby & Kids Noise Reduction Headphones Noise Reduction Earmuffs For ages 0-2 I used these once because I was going to a place with loud noises. After that, I stored them at home. The sponge part on the inside had different indentations on the left and right sides. (I only put them on my child's ears for a short time, so I didn't touch the inside.) Available for immediate purchase. Thank you.