> How does it fit?
It fits nicely. The waist is elastic as in all the Cocoon products so it rides up sometimes but the fit is quality. The zipper is lengthy allowing for good ventilation.
> How warm is it?
I pair it with the UL 60 quilt in the summer as my sleep system. I wear the vest under my windshirt or rainjacket on these trips while in camp and with a beanie on my head am more than warm enough.
> Is it comparable to the thermawrap vest in quality?
I have a Thermawrap Jacket but not a vest. Thermawrap sews 'baffels' into their jacket, the BPL garments don't have this so they are different when you're stuffing them, but the vest is so small you may not notice this.
> Who's using one and how are you using it?
See above. I also bring this on winter trips to pair with my PRO 90 Parka and/or Thermawrap Jacket. I took the vest on WTIII with the PRO 90 Parka, UL 180 Quilt, UL 60 Quilt and was warm into the teens.
> How small does it pack?
It's small. But synthetic insulation is weak so don't crush it for too long.
> How durable is it?
The Pertex shell is durable enough for wear but you wouldn't want to go walking through the brush wearing only that material.