All three of our dcs sleep in one 'room' in our tent. It's technically a two-berth room, which means that the floor area is too big for two mats, but too small for three, which in turn means that at least one of the dcs ends up sleeping on the groundsheet.
Is there something that I can use to cover the entire floor area of the room, and which will provide at least the same amount of padding and insulation as conventional mats?