Used it last weekend for the first time. I have the long/wide 20* burrow in black and green. Got down to forty. I was damp and cold after being soaked by rain all day. The burrow was so nice to climb into (under?) after a hard day. I just wished I had brought my incubator instead of my synthetic DIY quilt - because I had some trouble with CBS at the beginning. The burrow kept me warm, except my head, but I had a hat on. As a bonus, by morning my clothes were dry. Half the weight and size of my sleeping bag, oh why didn't I shop HG first?