Make sure a cloth one is okay for the preschool. Many preschools require ones that are able to be immediately sanitized in the case of an accident. Our school is regulated be day care regulations. Our mats(we provide) are plastic, and have to be sprayed with a clorox solution when soiled or once a week if they are not soiled. The kids bring crib sheets to cover the mats and blankets and small pillows if they like. It is easy to bag up the bedding, but would be impossible to bag up a whole mat if the child had an accident.
Marsha