I use a german army sleeping pad because its nice and long and wide and folds up into a square that fits pretty much anywhere.
The wool blanket is to add insulation to the sleeping pad, most pads are to thin and cold in the winter.
I do not recomend the therm-a-rest ridgerest, its very short and I got frost bite on my big toe using it in november one year and lost feeling in it.
The GI pad is very nice, its big and long and thick.
Although it does take up some space.