I forgot to mention "gossamer".
The sewn-through quilt is so light that is almost not there. It is replacing the fleece throw that I have used as a TQ in summer temps. I had a chance to test hang last Sunday afternoon, but the day was so blasted hot that I couldn't snuggle down under it for very long. I plan on an urban hang this Friday and Saturday so I may be able to put it to real world use.
A thought came to me yesterday: I can nest the 45-50 degree Burrow TQ inside my 3-season Burrow TQ to extend the temperature rating. True, it will not be the lightest solution, but it will work for me.
Jim