Featuring flex-and-fit motion-activated technology, BEDGEAR’s StretchWick fabric construction complements the contours of the mattress and body while providing all-way stretch for a flexible fit. With a breathable waterproof barrier to protect your mattress, all-way stretch provides resistance-free comfort with enhanced airflow. The flex-and-fit motion-activated technology allows all-way stretch to provide resistance-free comfort while you sleep and a flexible fit on your mattress, even when using an adjustable base. StretchWick has a lightweight and moisture-wicking fabric that allows for enhanced airflow, so you sleep dry. The invisible aterproof barrier reduces the buildup of allergens in your bed and resists liquids and stains for clean sleep. Machine-washable and dryer safe for easy care.