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