SOL Heatsheets Emergency Blanket

Best when new.

I used this once to keep my butt dry while I sat on a riverbank while my son played in the water. It is not a very good thermal barrier, being so thin heat conducts to the ground right through it. The aluminum coating might reflect radiant heat and as a tarp it certainly will keep you dry and out of the breeze.

That said when I went to use it a second time all of the aluminum reflective material had come off. It still will make a light ground cloth or an emergency tarp, but its claim to fame reflectiveness is gone. 

An emergency blacket that is small enough to fit in a large locket on your pants or jacket. If you become separated from your pack/camp (don't laugh, it happens) you will be glad that you had this blanket with you.

Hopefully you never need it, but if you do it will be the best $6 you ever spent.