TheraGel memory foam offers up to 400% greater airflow than other memory foam toppers while the quilted cover with Cool Choice breathable gusset keeps you from getting too hot. * NanoCool fabric wicks away moisture to keep you dry and comfortable. * Ultra-soft quilted performance fabric cover with SLEEP-FIT Technology is ridiculously soft and luxurious to the touch. Features flexible microfibers fits mattresses up to 21 inches deep. * Ultra-luxurious, extra-responsive 3-inch memory foam enhances comfort by relieving pressure. * IsoFresh system neutralizes odors. Hypoallergenic to decrease the likelihood of allergic reactions.