I wear a Patagonia capilene baselayer and am often surprised by how dry everything (both myself and the baselayer) are beneath the ShakeDry jacket. There’s exceptions for sure: harder efforts, slightly warmer temperatures, times when the wrists off of my shirt “wick” water up into the body of the shirt/jacket, etc.

Overall though for cold (32-45F) and rainy weather like we get a lot in the PNW, it’s an amazing fabric.