I live in Virginia where we often have temps over 90+ degrees in the summer. Since the AC runs, I adore my gentle wool batting quilt for naps and even at night. Wool is very light, soft, and breathes; I find it much more comfortable than Warm and Natural or other cottons. The batting I used was Hobbs wool which is carried by Connecting Threads and is often on sale. Yes, it can be washed just fine.
Jan in VA