I purchased this new last year. I am selling it because I have too many high-neck innerwear items. It is made of 100% cotton and is a very soft material. I wore each item 3-4 times. On the black one, there is something that looks like a different thread mixed into the fabric under the neck. I noticed it when listing the item. I think it was mixed in during the clothing manufacturing process. See image 10. Great as an inner layer for sweatshirts and knitwear.