Foam cores maintain their shape and offer consistent support, making them ideal for seat cushions that need to withstand regular use. Seat cushions are usually made of foam for this reason.
Fiberfill creates a cloud-like softness that compresses and molds to your body but may require occasional fluffing to maintain appearance. Some sofa backs prefer to have fiberfill for good, comfortable back support, as it provides that sink-in comfort perfect for lounging.
However, the choice ultimately depends on your sofa's design and your personal comfort preferences. For optimal comfort, we at ZIPCushions often recommend foam for seat cushions that require reliable support, and fiberfill for back cushions that provide a plush, relaxing feel.