The warmest quilts I've made have Thinsulate batting and anti-pill fleece backing. They are toasty warm and very light-weight. I don't think you can buy Thinsulate batts any more, but Hobbs has a product called Thermore which behaves almost the same way. No shrinkage from either of these, but you have to tell the recipient not to launder with any kind of fabric softener (liquid or sheets).