My MIL made a quilt out of polyester clothing in the early 70's and it looks as though she made it yesterday. It weighs a TON! When we used it I had to take it to the laundromat to wash it in one of the big machines and I had to hang it over the fence to dry it. Even in the heat of the New Mexico sun it took over a day to dry. She machine quilted it in tiny little stitches and it has held together nicely. It brings back good memories.