Hi LGD,
Naturepedic is a smaller manufacturer that uses good quality materials in their mattresses. They are also one of the few manufacturers in the US whose factory is organic certified as well.
Having said that … a mattress is only as good as its construction and the quality of the materials inside it regardless of the manufacturer and Naturepedic tends to be in a more premium price range than other manufacturers that make similar mattresses that use the same or very similar materials so I would make some careful value comparisons if you are considering them.
You can see the details in post #4 here 
Phoenix