Air ports allow air to circulate freely, making the sleeping surface warmer in winter and cooler in summer. Machine wash.. A quilted layer adds extra cushioning; wide corner bands hold the topper in place on any mattress. This unique Mattress Topper has four comfort zones of self-contouring memory foam that act as a pressure relief system for your body. Balancing your pressure points improves blood flow and keeps you from tossing and turning.