Thank you for viewing! ♡ This is a handmade item ♡ I make each item with care, but they are not perfect. Please refrain from purchasing if you are concerned about minor details. Thank you for your understanding. Materials: Outer: 100% cotton Inner: Cotton bleached cloth Size: Approximately 11.5 x 19 cm ⭐️ Suitable for around third grade of elementary school, but please check the size as individual differences exist. ★ The center vertical seam is stitched with two layers to make it less likely to touch the mouth and easier to breathe. ★ I have made it durable by stitching as much as possible, so it should prevent shape loss after washing and be easy to care for.