According to our testing, over a long enough period of time, a cooler with closed-cell foam will keep things cool for longer. But in the 24- to 48-hour range, we haven’t seen a huge difference between using ¾ inch of closed-cell or open-cell foam in a cooler. Closed-cell foam is considered a better insulator than… Continue reading This Coleman ice chest keeps up to 100 drinks cool for 5 days