Double. 1350(W) x 1900(L)mm Mattress toppers are designed to add an extra layer of comfort but our Ascot duck down and feather topper gives you a level of luxury that is out of this world. Unlike most other mattress protectors it contains two layers of duck down and feather. The top layer is 100% down, the bottom layer is 90% feather and 10% down. Filling: 90% feather, 10% down filling, Top layer (20mm): 100% duck down Fitting: elastic straps. Cover: 100% cotton. Weight: 1400g/m²