Skoy
Skoy's core product is a 70% cellulose / 30% cotton cloth - unbleached, chlorine-free, and fully compostable, with an independent test showing it breaks down in about five weeks. There's no plastic in the cloth itself, which is exactly the point: it's a reusable, compostable answer to both paper towels and synthetic sponges.
How clear are their specs?
States the cellulose/cotton ratio, the unbleached/chlorine-free processing, and cites the independent compostability test.