Is there some process on these batts to keep them fluffy? Some years ago my mother gave me a comforter that she had hand carded the wool in it. I didn't realize it would be a problem when I washed it and the wool did not hold up. I essentially ruined the piece. And then, if those homemade wool dryer balls tend to felt, what keeps these wool batts from doing likewise? I've never used a wool batt so am interested.