There are many Category values in foams. http://goo.gl/w8OehW
This line is mostly used by furniture manufacturers that supply furniture to good stores. Good value for a conventional foam. Used for seating and bedding applications for full foam mattresses. Stores call it the best. We make better mattresses because we use better foam.
- 1830 -Medium
- 1838 - Med Firm
- 1850- Extra Firm
Hope this helps