Standard fit: This garment is true to size for an easy, comfortable fit. Whether Diablo Dynamic Zip-In Compatible Jacket is your reliable wet and windy weather protection thanks to DryVent™ fabric technology. It features an adjustable hood and hem, zipped hand pockets and pit zips for a breath of ventilation when the temperature turns up a notch. Build out your layering system with a moisture-wicking baselayer and a fleece or synthetic midlayer for insulation depending on your level of activity. In coldest temperatures layer with a down filled jacket. Milder Temperatures Add a moisture-wicking baselayer and light fleece or midlayer