The Herringbone Collection is a loop pile made with 100% wool from the finest wool providing a natural resistance to soiling and staining. No additional chemicals are applied to this product making it eco-friendly. Other attributes include non-allergenic, humidity control, biodegradable, and is made from all natural fibers. These wool carpet stair treads only look beautiful and feel great! WHY YOU'LL LOVE THEM! All wool stair treads come standard with our sewn-in fiber pad backing for extra comf