The 'hood's tent-like properties keep the rider dry, even in blowing rain.
I've been product testing and writing a review of a rain cape from Cleverhood. Although it's not a bike specific product it definitely has some bike friendly features. Here I am testing it a few weeks ago in a strong wind. Today, it finally rained (imagine that in Arizona!) so I tested it this morning for waterproofness (is that actually a word?). Combined with a stylish pair of Wellies, it's pretty good! Very New England-y. Did I mention that the Cleverhood is American made in Providence, Rhode Island?