It is actually one pair of 3oz super fuzzy warm sleeping socks, not 3 pair :)
The foamie is similar to reflectix you find at home depo, except it's open cell foam in a mylar sandwich. One of my friends at the pike fish market saved it for me when he found it insulating a box of fish.
When it's warm, i use it under my bum with my neoair mostly deflated. When it is colder, i move it to the top. Makes the neo a comfortable, warm, light and 25" wide pad.