Cocoon Pullover shows out of stock and not available for me. Maybe a diff size.. Anyway,
As far as the different insulations, Polarguard Delta in the Cocoons vs Primaloft1 in Compressor.
There is/was an update to the Primaloft product line, look for Primaloft "with Convexion Technology", about a 10% improvement in clo/oz.
From a post by Richard Nisley:
-The now discontinued Polarguard Delta is .68 clo/oz.
-Standard down (550 fill power) is .70 clo/oz.
-Cimashield XP is .82 clo/oz.
-Current Primaloft One is .84 clo/oz
-Primaloft One Convexion is .92 clo/oz but, it will not be generally available until late summer or early fall.
-800+ fill power down is 1.68 clo/oz at the density used in most UL manufactures products such as Mont-bell's (2.16 kg/m^3).
Although by these nums, Delta looks pretty bad, it supposedly does have the excellent quality of restoring >90% of loft after wringing out, whereas IIRC Primaloft did like 33%.
Some have said PL resists getting wet better in the first place. This is all alot of hearsay. One thing in Primaloft's favor is the much better packability vs Delta.
I have a real warm Patagonia DAS parka, but it takes up my whole pack!! and you are supposed to avoid crushing as much as possible, to maintain loft.
Other factors to consider, besides what Allison mentioned:
Also, type of construction, baffles vs sewn thru.
Also, density of outer shell to block wind. (Inner or liner jackets).
A snug fit on the neck.
Allison, did you ever get that Thermawrap? Like it?