"Marmot Ion is not breathable." - Review of Marmot Ion Windshirt - Men's

I have found Marmot Ion Windshirt well designed and truly light, but it fails to allow perspiration to pass to the external side. I used it for hiking and, after wearing it for a while, my t-shirt became damp. As my arms were bent, sweat began to pool in the jacket’s sleeves – this, while the external part of the jacket appeared to remain almost completely dry. I was shocked by a stream of sweat, which escaped from the jacket when I straightened my arms. I was not aware that a permeable material was capable of holding water so well.
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