These pajamas are made of a fluffy, soft, marshmallow-like fleece material that feels great against the skin and is also very stretchy. The fine fleece fabric keeps you warm, perfect for spending the winter. I wore these as one of my five pairs of pajamas for one season, but they've become too small. I think they still have plenty of wear left in them, so I'm putting them up for sale. If you have any questions, please feel free to ask in the comments m(_ _)m