How will it keep your core warm? By keeping the wind off? Any water will surely pour in through the arm holes (saturating your clothes quicker than if you had a jacket with sleeves), in which case you'd get the same benefit from a windproof vest.
I guess if it was torrential rain it'd do that. It's a tight fitting thing so wasn't imagining too much saturation through arm holes.
Prob just go with a jacket then, I suppose the pack size isn't much difference.
@atk started
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How will it keep your core warm? By keeping the wind off? Any water will surely pour in through the arm holes (saturating your clothes quicker than if you had a jacket with sleeves), in which case you'd get the same benefit from a windproof vest.