Aunt and grandpa who sell popsicles always cover their boxes with quilts for fear that the popsicles will melt. Because quilts can keep warm in winter and insulate heat in summer. In summer, the popsicle box is covered with a quilt, so the sun can't shine directly into the box. The hot air outside is not easy to pass into the popsicle box, and the popsicle melts slowly. If the quilt is not covered, the hot air outside will run into the popsicle box, and the popsicle will melt quickly when it meets the hot air.