Skirted Mattress Topper, Fiberbed (King) Approx. 78"W x 80"L x 18" Deep Hypoallergenic "puff ball" polyester fill 1-1/2" gusset allows for optimum support Brushed microfiber cover with satin cording. Bafflebox construction for maximum loft and minimal shifting Fits mattresses up to 22" deep, Elasticized skirt keeps fiberbed securely in place