Made of 100% cotton, I used this for my baby when their hair was still thin. It's a bit large for newborns. I think my child used it in the summer around 5 months old. It's stretchy and seems like it could be used until around 1.5 years old. There are no stains or marks, and it doesn't seem like there's much wear and tear, but I did wash it each time I used it. Images 3 and 4 show the inside. The color is light pink.