I wanted to recommend Klymit to replace your foam pad. I have used both the Static Recon 18 oz and the Inertia X Recon 9oz. Both work great. They keep you warm and they are more comfortable than a foam pad. I settled on the Static because I toss about and sleep on my side. The Static is wider and works better for me. But if you sleep on your back then the Inertia is good to go.
The beauty of using Klymit is how you pack it. I leave it in my Bivy under my sleeping bag. So it takes up no room. Also it inflates fast and more important it deflates immediately. I can open valve and start stuffing system into pack. No fuss.
We bought my SIL the insulated static Vlux (see link above, this was based on his height, and what was available) for Christmas. He is active duty military and was going “to the field”. He said it worked well and slept well. His use of the system was exactly as Kitty said. And the red color is not an issue as it stays inside his bivy.
I will say I bought it on sale at Costco for much less than the posted price (the rep said they are at Costco twice annually)
REI has there own brand of self inflatable sleep mats that fold up to a very small size. They have a honey comb structure which is very supportive that is aided by the air. They have about 5 different sizes. I’ve used these mats for quite a few years and been quite happy with them.