The features of ultrasonic quilting : 1)This kinds of quilting is no needle and thread . So the finished products looks nice and flat. 2)After processing , the finished products have no pinhole and seepage , so the products is more waterproof. 3)We use different ultrasonic quilting design on products according to our preference. ● Top fabric :100% polypropylene non-weaved fabric ● Bottom is low cost waterproof layer PVC ● Skirt is 100% polypropylene ● 1.1cm elastic around bottom