I cover ironing boards. I use warm & natural--2 or 3 layers. I am not sure of the insul brite. There is an aluminum type fabric-- Namcy notion or clotildes but I don't care for it. I uses a sturdy 100% cotton--duck or sometimes maybe upholstery fabric. Found most of mine a Wm . I uses the serger & thread a cord (like commercial ones) & serge the cord on. Inst in serger book. Make new ones every 2yrs or so (depends if I leave iron in wrong position & burn it lol) One could sew bias tape around the edge for cording also.. Really like these & have made for friends & family