The GioPillow (Geo Pillow) is made of breathable mesh material to support your baby's comfortable sleep. Size S Used for about a month, but it's in good condition with no noticeable stains. Both the pillow and cover will be washed before shipping. Please note that this is a used item and has been inspected by a non-professional, so there may be some oversights. I hope that those who understand this will purchase it.