The way they explained it was it is designed to work with the Apex hoody to keep bulk down, and to provide just a little more insulating property. It is MUCH thinner than the Active jacket, and overall weight of it is really low. 100% designed as an August and September system piece. I agree, I wish it had full sleeves, but I guess you can take that up with Barklow at Sitka. Sounds like they didn't want to add any bulk in the sleeves area to interfere with bow strings. That thing is between a Core lightweight and mid weight in material thickness. It's hard to describe until you see it in person.
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