These durable mound covers are weighted within the hems to keep them in place. Covers do not require sand bags or stakes. Made from premium heavy-duty 18 oz. vinyl that is both UV and weather resistant. Perimeter has heat sealed seams that are reinforced with grommets. Dark Green is standard; covers are also available in Black, Red and Royal Blue (please call for availability of other colors). 3-year pro-rated warranty. Available in 4 sizes.