Slumber Solutions Big Bump 3-inch Memory Foam Mattress Topper (Full) Big bump means big comfort. The sculpted foam design provides support and additional air flow for improved comfort. Type: Memory foam Memory foam is designed to reduce motion transfer and distribute weight evenly to help relieve stress points and muscle tension. Originally developed by scientists as a stress-relieving material for the NASA space programs and proven to provide pressure point relief Full: 52 inches wide x 73 inches long