GILBERT C Took it tent camping in Arkansas in the summer in July. I didn't think I needed anything more than this to cover with, however, it was still fairly chilly at night so I wouldn't expect that on it's own, it won't protect more than a 5% temp drop. It might be a little more if combined with a sleeping bag. I bought it mostly to protect the sleeping bag itself from sweat during summer months since it's easier to wash this than the entire sleeping bag.

AARON W I have used it with my 20?F sleeping bag in below 32?F weather and I definitely felt warm. I'm not sure what the specs are but I believe it will help keep you warm at 5?F cooler than your sleeping bag's temperature rating. Also, in the summer, it is nice to have it as a light blanket on warm nights.

JANINE H It's a LINER... you add it to a sleeping bag increasing it's warmth by 10-15 degrees. So if your sleeping bag is rated to 30 degrees, by adding the liner, you should be warm to 20 degrees.

CODY C very good product not necessairly to be used alond but the liner increases a sleeping bag rating by ten degrees ie.if your bag is rated 0 degrees it will take you to -10