1. nylon 2. WATERPROOF BIKE COVER - The exercise bike cover comes with waterproof material and water-resistant laminated undercoating,can prevent rain,wind,sun,snow,dust,dirt,birds,wet leaves,etc.Keeps your exercise equipment dry and clean! 3. WINDPROOF & DRAWSTRING - An adjustable cord around the bottom can fit the cycling protective cover snugly,ensures the stationary bike cover prevent from blown away by the strong wind.Suitable for indoor and outdoor use. 4. DECENT MATERIAL - High density 210D Oxford fabric,sun resistant and with a PU coating.High-density stitching is more robust. peloton bike cover can keep your fitness equipment from those elements,household dirt,pet hair,debris. 5. UNIVERSAL FIT - Size-48"L x 23"W x 56"H.universal to mostupright exercise bike,spin bike,peloton bike and gym bike.Please measure carefully before buying your exercise bike dimensions.