I make charity lap robes all the time. I have two finished sizes that seem to work fine so far, 30" x 36" and 36" x 42". These don't get caught in the wheels and seem to cover them just right. I use whatever batting I have on hand, some don't have batting if I use flannel for a backing. Thank you for doing this charity work that the residents will appreciate. From one quilter living in Lakeland to another!!!