From the purchase site (Rakuten Zooland) 【Material】 The part that touches the skin is made of 100% cotton, which is gentle on the skin, and the inside is a warm quilted fabric with thin polyester padding. ■ Features of knit quilted fabric Gentle on delicate baby skin, Soft and comfortable knit quilted fabric. It gently wraps the body with moderate stretch in both directions. It has excellent water absorbency, so it is comfortable even when you sweat, and it also provides excellent heat retention. It is a lightweight yet sturdy fabric that is excellent in breathability, strength, and durability. It is useful as an inner layer and is a fabric that is resistant to repeated washing. ✦✦✦ I forgot I had it, and I've only worn it once. Thank you for looking. I will ship as soon as possible, but due to childcare, I have set the shipping time to 4-7 days. Thank you for your understanding.