Made of natural coir, a dense fiber that is naturally mold & mildew resistant. Coir is a renewable resource that is durable & Coarse, excellent for scraping shoes clean. Vinyl backed for increased durability & to help Prevent movement, coir doormats are weather tolerant absorb moisture & retain Their shape. For best results keep in a sheltered area such as a covered porch, keeping extreme moisture & sunlight to a minimum. Vacuum, sweep or lightly hose clean.