Made with 10 ounce double-knit polyester material. It's heavy enough to be rugged and durable over the long haul. At the same time, it's light enough to ventilate and keep things from getting too hot. Also, it has a "give" instead of the usual elastic stretch. So, unlike elastic, it can't bind too tight. Made for daily washing. It comes with a convenient hook & loop closure. Your choice of regular in 12' or 9' pony length. Sold in sets of 4.