What makes this fiberbed different? For that extra layer of soft support, our Fiberbed mattress topper offers the perfect balance of softness and support, providing over 2” of cloud-like cover that sits over your mattress. It’s made in a single-chamber design and filled with PrimaLoft® Luxury Down Alternative®—a premium, down-like fiber that mimics the weight and gentle loft of down in an innovative, hypoallergenic fill. The unique baffle box construction keeps the fill perfectly in place to maintain fluff and shape over time, all wrapped with a soft, breathable fabric shell. The Feel Sumptuous and Supportive – A resilient, single-chamber design with premium PrimaLoft® Luxury Down Alternative® fill