The ancient city walls and the mortise and tenon structure inspire the product. The accordion-like structure of the quilt head can flexibly open and close to accommodate the body's contour, ensuring maximum warmth and preventing the ingress of cold air. The 4DBOX yurt pleating process maximizes the stretching of the down by staggered pleating, increasing the air storage for even warmth keeping. Moreover, the boneless quilt head minimizes the sewing gaps, preventing the down from escaping. The 45° inclined lattices on the quilt, with a contemporary aesthetic, improve the fit and warmth.
