Not very warm. Yep, 5 stars and it was not very warm. I used my ECOOPRO during a sail boat transit of the Caribbean from Grenada to Costa Rica. It performed flawlessly keeping skeeters off in port and calming the breeze of the fan at sea. I'd not use it for a autumn evening and winter is a no brainer but in the summer (or a couple degrees off the equator)... perfect.
... outdoors and it got in low 50's and was comfortable with this
Slept outdoors and it got in low 50's and was comfortable with this. I won't be using it again but will be giving it to my wife or kids. I personally couldn't zip it up to my chest, but that's not the bags fault! I'm 6' and 200 lbs (athletic).