It is necessary to sew a fixing belt on the four corners of the quilt cover to match with the small lifting rings at the four corners of the quilt cover. Fix the length of the belt so that it can pass through the small lifting ring to tie the knot firmly. Don't be too short, lest you can't tie a loose knot. It doesn't need to be too long, and there is still a margin after knotting to affect the comfort of the four corners of the quilt.