OMI's handmade, custom organic mattresses are manufactured in Northern California by expert artisans. There is a reason why OMI makes the #1-selling organic mattress made in the United States: No other organic mattress manufacturer can match OMI’s purity assurances. And since OMI makes absolutely no conventional or chemical mattresses, there is no chance of toxic chemicals ever contaminating our mattresses or bedding as there is in a mixed production facility.