This is a sleep sack for the fall and winter. It's in good condition because my child didn't want to wear it. Size S (for ages 0-3) Please check the images for size details. Material: ・Front: Flannel fabric ・Back: 100% organic cotton Note: It is recommended to wash it before use. ・Good texture, safe for sensitive skin. ・Sleep sack: You can easily change diapers or clothes by unfastening the sides and shoulders of the sleep sack and laying the baby on it. It protects the baby's shoulders, tummy, and feet from the cold. ・Safety: Made of 100% natural material without fluorescent agents, so you can use it with peace of mind.