Absorption Plus Waterproof Mattress Pad, 200 Thread Count, Size King (75331-5) by Absorption Plus. $94.99. It features a durable 200-thread-count cotton top for the utmost in comfort. The special inner lining thoroughly absorbs liquids, to keep you dry, and the quiet waterproof backing provides long-lasting protection. The StretchKnit. skirt is to fit mattresses up to 16-inches thick.