What does it mean for a mattress to be “roll packed”?

Roll packed mattresses are mattresses that have been compressed and rolled up for easier shipping and storage. This process involves using specialized equipment to compress the mattress to a smaller size and then rolling it up tightly. The resulting roll is typically smaller and more compact than the original mattress, making it easier to store and transport. Unfortunately to achieve this it is necessary to use lower grade foams to allow for this level of compression as well as reduce the weight to make the shipping costs low enough to make it economically viable.  This makes for mattresses that wear out more quickly.