Integral Designs is no longer in business, and the South Col has been discontinued. If you're looking for something new, check out the best bivy sacks for 2021.
Historic Range: $96.95-$218.95
Reviewers Paid: $145.00
I like it. It has a wire stiffener that keeps it off your face, and a partial zipper down one side for ventilation and ease of entry and exit. I set mine up with my head a bit higher than the rest of my body so I can leave the main zip completely open in a snow storm. I noticed that the fuzzy wicking interior surface retains some frozen moisture (from body vapor) like the fabrics in single wall tents. This makes it hard to put it back into the stuff sack, so I don't use the stuff sack (a good idea anyway to save weight and time).
Design: bivy sack
Ease of Setup: just roll it out
Weight: 1lb 14oz
Price Paid: $145