FULL SIZE DOWN MATTRESS-Feather Bed/DOUBLE/Topper/Pad Willow Highlands Willow Highlands, 54" x 76" x 4" Standard Full / Double Size Down Pillow Top Mattress Pad. This mattress is also great for rejuvinating an older bed's mattress, or increasing the comfort of a sofa bed. For luxury that lasts, the entire outer shell is made of 100% Cotton (300 t/c) down-proof fabric. The 18 oz. top layer of down is composed of a minimum of 85% fluffy down with a minimum fill power of 525 The 13 pound lower layer is composed of 95% small feathers, and 5% fluffy down.