I have both a bora bivy and bora tarp. Big fan of the tarp, the bivy is not bad. I got the wide bivy and should have gone with the narrow, because everything really slides around. I have mostly fixed this by tieing up the extra material around the footbox. My sleeping bag doesnt have a hood, so if a cold gust of wind comes in neither the bivy or my bag protects me. For high buck this year I am planning on switching to a bivy with a hood, I will still use my bora for places and times that have bugs though.