I just picked up this bivy from work yesterday and am looking forward to spend some time in it this spring chasing bears. It only weighs 1 pound 12 ounces minimum weight and the top of the bivy is made out of eVent. For those of you not sure what eVent is, it breathes 3 times better than gore tex which prevents moisture building up inside a bivy, jacket or footwear. The stuff works amazingly well. Anyways take a look at the photos and let me know if you have any questions.