I don't worry about the fabric, either. But please note that the oils can coat the lung cells. Over time, the oil coating makes it difficult to breathe. It happened to my sister in law, only she just coated the outside of her nostrils (dry skin) once a day, with mineral oil. Cumulative affect of doing that (and unknowingly breathing in oil molecules) for years resulted in difficulty breathing. After all kinds of medical tests with negative results, a dr finally ordered a lung biopsy. The air sacs in the lungs were coated with oil. They could not take in oxygen or took in reduced amounts. She is in her 60's and tethered to an oxygen machine.