Cardinal Health Porta-Warm MattressProvides instant, controlled heat therapy at a safe maximum temperature of 104F (40C) during infant transport for up to 2 hours to help prevent hypothermia Portable and convenient, the soft, nonwoven wrapped mattress requires no electricity or wires and helps absorb vibration during transport A special outer bag keeps the mattress clean before use and eliminates the risks associated with cardboard storage in the intensive care setting The 9 1 4" x 19"