Portal Men's Code Wind Vest - BelugaUpon first glance, the Code Wind Vest appears to be a fairly simple style, but there's plenty of forward thinking details and intriguing features once you peer a little closer. Take the fabric for example. It's a Japanese nylon ripstop that's been adroitly constructed with a reduced CFM (cubic feet per minute) which drastically reduces the air permeability of the garment and vastly increases its windproofness. Those who run hot needn't worry either