I received this sleep sack with the intentions of using it to car camp when I road-trip but it is very thin NON-STRETCH silk and will tear if used a few times. I did not even bother trying to use it because the silk is so thin. So I returned it. Would be much better if it were stretch to allow for some flexibility to toss and turn while sleeping. One really nice thing is that you can cover yourself in this and see around you, (silk is see-through from the inside looking out) but not the other way around (nobody can see you sleeping.) This does not fit my needs, which is a shame because I thought it was beautiful and a nice idea.