A memory foam mattress uses a specialized foam designed to respond to your body weight, pressure, and heat. As you lie down, the foam contours to the shape of your body, creating a personalized sleep surface that helps distribute weight more evenly and reduce pressure on areas like the shoulders, hips, and lower back. This adaptive response can help improve comfort and support while minimizing motion transfer between sleep partners. When you change positions or get out of bed, the foam gradually returns to its original shape.