new Arcteryx Atom Jacket thinner than Old Atom LT Jacket?

Hi all,

I have an Arcteryx Atom LT Hoody........then I got a New Atom (non-hoody) Atom Jacket.....the website states the new Atom is the same as the old Atom LT.

.......but, my new Atom feels thinner than than the old Atom AT, slight thinner insulation, enough that I can notice the difference.

I called Arcteryx, and they said they are the same jackets and should have the same insulation and thickness, but when I explained my observations to them, they did not have a good response.

....so I am just checking to see if any of you have both the older Atom LT and a newer Atom and can tell me if they feel the same or different in thickness or insulation?

Thanks!

Depends on how old we are talking. The old coreloft was puffier than the more recent coreloft compact that has replaced it. This would have to be comparing 2 jackets that are atleast half a decade apart (probably more) and I'd be surprised to see the old coreloft maintaining that much loft unless it was barely used.

Another potential explanation I could give is it's simply an iterative improvement manufacturing side and they have made coreloft compact even more compact. 

Finally, it's possible the jacket wasn't stored properly at some point before it got to you and lost it's loft there due to long term compression. 

Plain Coreloft is a continuous filament insulation (like climashield apex) which is bulkier/less compressible but significantly more durable. Coreloft Compact is a short-staple insulation (like primaloft gold) with the additional benefit that it has been processed into relatively stable sheets (fewer sewn baffles)which is less bulky/more compressible but less durable.

My experience with primaloft gold is that it loses a noticeable amount of loft/warmth with ~100 days of backcountry (ab)use, while Apex takes about twice as long to get to the same point. No personal experience with Coreloft compact.

I thought the old ones feel thicker because I washed them. The new feels thinner and colder and has an embroidered logo that absorbs faster water then the printed logo.