Washing instructions for NCT x Sanrio pajamas??

I just bought them brand new off of Mercari. The seller said they can't find the washing instructions on the site they bought them from and I cannot find it ANYWHERE. I've looked up so many search terms but nothing is coming up. Does anybody know the washing/care instructions? The material feels quite delicate and kind of thin, I don't want to ruin it. I got the Jungwoo ver (ik the material is different for each set.)