... Use for 6-8 hours >Environment friendly 2012 New Generation, New design, New Technology, Non-blocking, Non-toxic Ice ... -3 hours1-2 hoursOne hourFacing materialsSmooth and soft, with comfortable quality feelingUneven, uncomfortable quality feelingUneven ... , uncomfortable quality feelingRather hardSurface comfortComfortable and soft, suitable for reassuring sleepUneven & unsuitable for bed ...