Holy Lamb Organics certified organic wool mattress cover, basinet size. Use as a waterproofing layer under your baby's sheets to protect mattress. Small basinet size--lay over mattress and then add fitted sheet. Please note--there is one spot, shown in listing photos. A good day in sunshine outside might remove it. This is mine, bought new. It has been lovingly handwashed/air dried and I don't use any scented or dyed laundry products. This mattress cover is in very good condition and is ready for a new baby. I also have a crib sized wool cover and a crib sized flannel cover, as well as crib-sized bedding, all organic for sale.