Comfort Clinic 2-Inch VE Memory Foam Mattress Topper, Queen For improved sleeping comfort, 2-inch visco elastic memory foam topper for queen bed; great alternative to mattress purchase In 100-percent polyurethane, hypoallergenic memory foam with 2-1/2-pound density Responds to sleeper's weight and body temperature, molding to personal contours; reduced size for better fit under sheets After unpacking, allow up to 72 hours for topper to fully expand; available in other thicknesses and mattress sizes Measures 77 inches long by 56 inches wide by 2 inches high