I have used flannel with no batting as a backing on a quilt and it is the perfect summer weight. I also purchased quality ready made flannel sheets for backings and they hold up very well to washing. (Cuddle-Duds brand from Kohls) Shop around and I bet you will find some good flannel sheets that will work great for your husband's lap quilt. And if you find some on sale....bonus and may be less expensive than LQS quality flannel.