· NEW WONDERBOX PACKAGING - This mattress topper ships straight to your door in a box designed for unmatched convenience, plus a reduced carbon footprint! Simply unbox, unroll, and watch as this topper does the rest, expanding to its original shape within 72 hours· HELLO SLEEP - LET THE AIR FLOW, LITERALLY - The ups and downs and in-betweens of this specially engineered, cooling gel-infused topper promote airflow throughout its conforming memory foam layer to dissipate heat while providing superior softness and comfort· A COOLING EMBRACE - This 4-inch mattress topper is constructed entirely of supportive memory foam swirled with cooling gel; fits under any standard or deep pocket fitted sheet· CERTIPUR-US CERTIFIED - Highest quality foam is CertiPUR-US certified for durability, performance, and content· Worry-free 5-year limited warranty included; a new foam scent is normal and should dissipate within 72 hours