Shop Dr. Oz Good Life Say Goodnight 3 Memory Foam Topper, Twin online at Macys.com. Sleeping in a clean, cool space is essential for deep relaxation. The Say Goodnight™ Memory Foam Topper brings two refreshing infusions to your bed. Activated charcoal inhibits allergy-causing dust mites while CoolRelax™ gel pulls heat away from your body for all-night comfort.