Samwrote a review of Castelli Diluvio Shoe Covers on April 12, 2016
Familiarity: I've put it through the wringer
I wasn't aware that these shoe covers were advertised to be waterproof... I didn't expect that of them (I don't ride in the rain often) but now that I know I'm a little bummed. The last couples of rainy rides I went on my feet were definitely wet. Luckily, neoprene insulates well so even if your feet get wet they'll atleast stay warm. The covers are also durable and the stitching has held up great despite taking them on and off my shoes over and over. I do like the velcro cuff as well. I have used zippered cuffs in the past and I could always feel the zip against my leg (on top of being hard to zip up from being stretched). The covers fit a tad small. I ordered the L/XL and wear a 44.5/10.5 shoe and the covers are almost maxed out.
Bottom line: comfortable, warm, durable shoe covers that are apparently waterproof.