Arena footingApproximately 23 cu/yds rubber horse arena footing. Mixed 3/8 and 3/4 in. Mixed with a small amount of sand. Purchased from "Close The Loop" in PA. in 2009. Specs. call for mixing 1" rubber with 2" sand. There is enough here to cover one 220ft.x 150ft. arena or two 120 ft.x 75ft. arenas.