The Foamnasium Wacky Sack is made of polyurethane shredded foam, which brings tons of benefits! One, the shredded foam offers a softer seating surface, while also maintaining a more supportive core. Two, it's not nearly as messy as those annoying Styrofoam beads. The Wacky Sack is soft, colorful, supportive, safe, and easy clean. It's the perfect bean bag chair for any playroom, daycare or classroom.