4" 5lb. Sensus Memory Foam (Visco Elastic) Mattress Pad Topper Overlay (Standard King Size) The Sensus Topper is our top-of-the-line luxury mattress pad. Four inches of five pound Sensus memory foam will give you the feeling you are floating in bliss. Free Shipping to Lower 48 States! Our Sensus foam mattress pad is softer than the 5-pound Tempur-Pedic topper Order with or without a 100% cotton quilted cover.