Our own ultralight , multi purpose camping mat.
Weighing in @ 80/100 grams and measuring 200cm x 50cm approx, lay the mat under your inflatable mat to protect it and to stop slipping on the tent floor.
it also adds a little R value to your sleep system, folding it up it can be used as a sit mat ,knee pad , back rest there are so many uses.
Strap to the outside of your pack as it doesn't absorb water and you will hardly know its there.