Suitable for children aged around 2-3 years old up to upper elementary school age. It's a large size. I've listed it as size 140. Actually, it was wearable for 4th and 5th graders. You can use it for a long time with just one piece. Also, it's a Japanese product, so you can rest assured. It's a good sleeper, so it shows some signs of use, but I hope someone who understands that will purchase it.