EverLite | Western Mountaineering
Priced about the same or a little more as the equivalent Enlightened Equipment quilts. The large (65" for 6' 6") 45*F Everlite opens up completely and will lay flat as a quilt. No foot box, has a drawstring at both ends. I bought it mainly for late spring, summer and early fall; I'll use it as a quilt mostly. I like WM bags and have another also.
I can't report on performance yet; just got it yesterday.
The Enlightened Equipment quilts do look nice. The 6'6" WM Everlite is about 17 Oz.
Sorry I missed the part about synthetic...this is a down bag. Read the title too fast...