Best purchase yet in my years of Scouting. Slept very well in the TX270 for a week in July and my back felt great every morning! And this Fall I added the underquilt and slept in windy, freezing and snowy conditions a few times and never got cold. Oh, and attaching the underquilt was easy and it made a good airtight seal. I was pleased. The Troop has a lot of Dads using all different hammocks and I was considered one of the best setups. Thanks for building a great product Clark!