A curved - and offset at the neck - zip helps keep the fit snug when worn slightly undone and its rain resistance is up with the best in this test.
Not quite as breathable as the best
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With its soft-lined collar, the Helium's comfort factor is high, but that belies its super-light construction.
The Dura Lite SL fabric is very, very fine, and as a result the jacket packs down small.
It allows a reasonable amount of moisture vapour through when working hard but this is no doubt helped by micro-perforations in the fabric on the less exposed areas.
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