The white t-shirt had a brown stain. They are definitely not 100% cotton as advertised. The composition of the substance is not mentioned anywhere on the label. But by the feel and the fact that it's stretchy, you can tell it's mixed with a synthetic material, maybe polyester or spandex. I am disappointed because my son is very sensitive to synthetic fabrics and almost impossible to wear them, "too itchy" so if you are buying these for a clothing sensitive child. I would not recommend it. Otherwise they fit well and look like a nice t-shirt.
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