This winter I took this bivy on a month long bicycle tour. The temperatures ranged from 50 to sub zero. The sack kept me warm and comfortable on those frigid nights, and with the bug screen kept me cool enough on the warm ones. The sleeping pad straps are excellent. It also has stake attachments which help prevent the sack from sliding around. Light and easy to pack
It is not as light as some other bivys. My biggest complaint is that it does not breath very well, even being gore-tex. After a week of use it began to mold heavily.