Ozark Trail Sleeping Bag Which Of These Sleeping Bags Provide More Warmth?

Which of these sleeping bags provide more warmth? - ozark trail sleeping bag

Fleece Sleeping Bag texsport says, it is 50 degrees F. cost U.S. $ 20

http://www.tentandstuff.com/image_manage ...

Ozark Trail Fleece Sleeping Bag does nothing. The cost is $ 10

http://mellow.smugmug.com/photos/5832743 ...


What makes the heat? How do I budget is $ 20