The regular warm and natural is NOT 100% cotton - read the label carefully. Many of them say 80/20 in the contents. I am not sure what the satin finish means on the thread. If the thread says 100% cotton, it should be 100% cotton. I would definitely contact the company to get that clarified. We sell dozens of the soup cozies each month and have only had one problem (the lady did not remove the pin!) but we are very careful about the materials and we attach a small card stating it is to be used to reheat - not cook - items, use for 3 -5 minutes. BTW - we have used them for 8 minutes without any problems, but we prefer to err on the side of caution.