An OMI mattress during it’s flammability test. This test torches both the side and top of the mattress. The only fire-retardant used is Naturally Safer wool. OMI doesn’t use any chemicals or silica in our mattress construction. You can see the wool smoulder, but it does not catch fire. They passed the test with flying colors. The mattress shown has an attached 100%-natural rubber pillow top and is on a wood slat foundation.