The Ultimate Sleep 3" quilted topper IS designed to sit atop your existing mattress to create a more cushiony, natural sleeping surface. Encased in organic cotton sateen and filled with domestically sourced premium eco wool batting, these toppers provide a comfortable, breathable sleep surface that naturally regulates body temperature and wicks away moisture. The luxurious wool batting is secured by hand tufting that keeps the wool in place and creates a plush quilted look and feel. Adding a topper allows you to fine-tune your sleep system to your comfort preference. Sleeping on a natural surface has also been shown to lower your heart rate, resulting in a deeper, more restful sleep.