maxcold outdoor cool box the maxcold 40 roller, like the other coolers in the maxcold? series, has an ultratherm? insulation in the cooler and on the lid. this allows the maxcold 40 to retain ice for up to 5 days at an ambient temperature of 30 degrees celsius. the heavy duty wheels are suitable for any type of terrain and with the reinforced handle they allow easy movement of the cooler. safety manufacturer: country of manufacturer: united states