Willow Highlands KING SIZE DOWN MATTRESS-Feather Bed-New/tags/topper/pad Willow Highlands, 78" x 80" x 4" Standard King Size Down Pillow Top Mattress. 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 28 oz. top layer of down is composed of a minimum of 85% fluffy down with a minimum fill power of 525 The 20 pound lower layer is composed of 95% small feathers, and 5% fluffy down.