In the 18th century, stays were most predominately made using baleen, known by whalers who harvested it as whalebone. The keratinous material found around the upper jaws of Baleen (Whalebone) whales was a strong material that provided support in undergarments while being flexible. It could be molded to shape thru heat and could be split down to the tiniest of bones while still maintaining strength. Baleen was still being used on into the 19th century when steel began to replace it. Our synthetic "whalebone" is manufactured in Germany specifically for the corsetry market.