John's Bedroom Barn Basic Mattress is a covered foam mattress that is ideal for kids, guest rooms, RV's, camping or other light use applications. There are 30 mattresses in total. We will sell them all at once or one at a time. We have used these on wood platforms with canvas tents for kids to sleep on during the summer and they are stored in a dry place during the winter. Locate the ad for new mattresses from John's Bedroom Barn provided