The 4 ft. Sack is great for both adults and children. It is larger than traditional bean bag chairs and is about 10 times more comfortable! All Comfy Sacks come with an internal liner that allows for the cover to be taken off and machine washed at your home. You won't have to worry about vacuuming up the foam pellets that fall out of traditional bean bags either because all Comfy Sacks have an internal liner and use polyurethane foam which is the same foam used in high end couches. NO STYROFOAM PELLETS HERE!!!! In addition you also won't have to worry about having to throw out the Comfy Sack as a result of it going flat like a traditional bean bag chair. We use high grade furniture foam that will not only outlast you but also your kids. It's unique memory allows it to go back to it's original shape instead of permanently flattening like the Styrofoam pellets in bean bags.