I have used Hobbs 80/20, Warm and Natural, Hobbs wool bat and Matilda's Own wool bat. Matilda's is heavier and much warmer. It is also quite washable. I currently Use Thermore for just about everything. It is light but very warm, which is what I like. Last winter I made myself a lap quilt with 2 layers of thermore. It is heavy and very warm. I think you will have to experiment to find what suits you. Thermore says it is the warmest bat on the market.