Cotton 【Breathable Cotton Fabric】240TC 100% cotton fabric top makes this feather topper surface feel breathable, it makes you feel super cozy. Sewn Through End-to-End Construction enabling down to expand fully to get the highest loft – providing maximum cushion. 【Superior Material】The Mattress topper is made of 90% white goose feather fibers and 10% goose down fibers. This is designed for comfortability and to create a soft space for you to get your needed rest. 【Anchor Bands】The mattress pad is equipped with four corners anchor bands, anti-movement stabilizing straps that grip the mattress so it doesn't slide no matter how you twist and turn in bed. It easily fits most mattresses and can be used in homes, hotels, and more. 【Dimensions】Twin: 39"x75" Fill weight 48oz, Full: 54"x75" Fill Weight 67oz. Queen: 60" x 80" Fill weight 80oz. King: 78"x 80" Fill weight 103oz. Elastic Corners to adjust to any mattress Size. 【Certificates】Enjoy the extra comfort of Serta's all-natural down beds. Serta packaging and products are certified by the American Down and Feather Council (ADFC), guaranteeing the highest quality standards.