One thing that I've learned from movies is that core temperatures must ALWAYS BE MONITORED. Another thing I've learned is that oil-drillers are our best defense against asteroids (but that isn't as pertinent). Whether it's a nuclear reactor or your own body, you gotta control core temps. The Black Diamond CoEfficient Vest handles this task perfectly. It covers your torso in Polartec Power Dry High Efficiency fleece and leaves your arms with total freedom of movement. This is especially noticeable when layering up in colder temperatures; there will be much less restriction around your shoulders and elbows. Super light, super warm, hardly perceptible, the CoEfficient Vest adds tons of versatility to any layering system.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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