If you are planning on a mattress set, this Pororo "yo" set will make a perfect choice. Suitable from newborn to adult (single size), it consists of a Mokhwa som (high quality cotton filled) mattress, a comforter and a long pillow. Mokhwa som mattresses are fluffy, cushiony and comfortable. Most of all, they go a long way and do not sink in the middle. Choose from Green, Yellow, Pink or Blue.