I ONLY use wool batting and I use all different brands. I throw them in the dryer all the time with no problem. There is the same shrinkage as with cotton batting. I've never had a problem. I love the warmth of wool, also, so that's why I only use it. But not with wall hangings or table toppers. Then I use 100% cotton. But in my experience, no problem in the dryer unless you don't like a little, and I mean a little, shrinkage. IMOO and experience.