Our Premium Ecowool Comforter is filled with our wool which is  from sheep that are raised organically, without antibiotics, hormones, or other chemical treatments and certified organically processed by Oregon Tilth. No purer wool exists, our Premium Ecowool is equivalent in purity to our Certified Organic wool it is so pure. We follow all this purity by doing our own testing in a third party lab. Outer fabric is organic cotton damask. These wool comforters are hand tufted for a soft, fluffy feel. Made right here in California and packaged in our pure food grade polyethylene for total purity.  Although we offer the heavy fill, we recommend you use the regular fill and add a blanket if you need more warmth - this allows you to use the comforter for more of the year.