This is an Agnes B. sweatshirt. It's made of thin sweatshirt material, but the striped sleeves are a different material, like a long-sleeved T-shirt. (6 ans) *Agnes B. sizes tend to run a bit small, so my child quickly outgrew it, and it's in good condition. French size: 6 ans (110-120cm) Please check the official website for sizing information.