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I've been layering this under a shell for morning trail runs and honestly forget it's on until the wind hits—the 900 fill traps heat like nothing I've owned. Weighs nothing in the pack when the sun comes out.

Took this vest up a chilly alpine start last weekend and barely noticed it was on—7 ounces truly disappears. The 900+ fill down packed a surprising amount of heat for something so light, and it layers perfectly under my shell without any bulk.

I was surprised how warm this vest kept me during a chilly morning hike, considering it only weighs 7 ounces. The 900-fill down really punches above its weight class for layering under a shell or wearing on its own.