“Active insulation” midlayer

Marmot Aerothermal is another one to look at. I havent compared it directly to the sitka ambient, but I got one a couple months ago while it was on sale and I was waiting for the sitka to be in stock and I'm fairly impressed with it. Super light, full zip, 90g insulation, 20D outer fabric.

The outer shell seems a little fragile to me, but people that have compared both say its very comparable to the ambient.
 
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