The back is made of a thin fleece-like material. There are no noticeable stains, but there is some wear and tear, so please be aware of this. - Design: Checkered long-sleeved shirt and pants set - Size: 60 - Material: 60% cotton, 40% polyester *Please refrain from purchasing if you are concerned, as this is a used item. *Please understand that this is stored at home by a private individual, and the condition is checked by a private individual. *Shipping will be compact, so there may be some folding wrinkles. *Please feel free to comment if you have any questions (^^) Discounts are available if you purchase other baby clothes or children's clothes. If you would like to change the set, please let me know in the comments (^^)