This mattress topper is 100% waterproof to protect mattresses from spills and stains. It also serves as a barrier against dust mites and pet dander. It features a revolutionary 3D surface that encourages airflow to help moisture evaporate faster. This cooling effect is enhanced by crystal gel fibers in the fabric that absorb heat and dissipate it away from the body. It is ultra-soft and durable to prevent crinkling and crunching. At the corners, super-stretch pockets provide a secure fit.