Perfect Fit 300 Thread Count Spacer Breathable Gusset Mattress Pad, King, White Enhances and protects your mattress; Designed to provide a layer of comfort and warmth between you and your mattress Constructed with a 300 thread-count 90-percent polyester/10-percent nylon face fabric to keep you more comfortable throughout the night Built with an amazing 10oz/yd. of Pearl Cotton Puff Ball Fill to provide superior support and loft; 1" gusseted edge insures a perfect fit and feel Hypo-allergenic makes it perfect for the sensitive sleeper; 12" Diamond Pattern with 6" border sewn into pad to keep fill from shifting or bunching Elasticized Knit Skirt keeps the pad in place and promotes better sheet fit; Guaranteed to fit mattresses up to 18-Inch