It seems like I've been on an endless quest for just the right winter shoe cover. One brand was cut too low and loose around the top, allowing water to run down my legs and into my shoes. A pair of GoreTex covers kept the water out, but didn't fit well -- way too much fabric, which seemed floppy and not aerodynamic. Castelli's Diluvio covers are like Goldilocks -- just right. It fits snugly over cycling shoes, providing a sleek, aerodynamic fit. It is ruggedly built, with serious reinforcement at the toes and around the heels. The neoprene is thick enough to provide warmth without being overly bulky and without overheating my feet. They sit snugly and well above over my ankles, and neoprene collars at the tops help seal out water on wet days. The hook-and-loop closures on the bottoms make it easy to put them on and take them off, and allow for easy custom fitting around whatever cleats you are running on your shoes. One word of caution, though -- like everything else Castelli makes, these tend to run small. There is no size chart on WBW's web page, so you'll need to check Castelli's site. I wear size 47 shoes, and a 2XL works well for me.
snug, reassuring fit for late winter-early spring rides from low-30s to mid-50s F. Just enough fleece and Wind protection in front half of chest, arms, and shoulders to feel comfortable at the start of a long ride in below-40 temps but with enough breathability in back half of arms and chest to dissipate heat later in the ride. I mostly use this on 25-35-mile road rides here in Eastern WA. Sylish cut, comfortable for sitting in an outdoor pub for an after-ride brew. Loses one star due to unimaginative 3-pocket system on back and no chest pocket.
I've been looking at this jersey for a while now and finally decided to pull the trigger. I couldn't be happier. It's not really a jersey, and it's not really a jacket, or maybe it's both. It doesn't matter what it is, only that it does what it was designed to do perfectly. I hate riding in jackets with any amount of flap, so the RoS jersey is perfect. The jersey is very windproof, which makes it exceptionally warm for its weight. With a thin long-sleeve base layer underneath, it has been very comfortable down to the low 40's. There are vents on the side that are functional, but I'm not sure they would be enough it warms up. I got the blackout color which is nice and stealthy with its use of logos. The sizing is, well, it's Castelli. I am 6' 2" and just a hair under 170lbs most days and got a size large. I like the fit, and it's snug. I only wear one thin base layer underneath, like a jersey. That is the fit that I wanted. I probably could have gone with an XL as well if I wanted more of a jacket fit. The bottom line is that it is an excellent jersey for cold, wet weather. You need to make sure you get the right fit for you.
In 36-60deg F weather these over-shoes have kept my toes from freezing on descents (I get numb fingers and toes easily). They're small enough to store in my tail bag when things warm up and they slip on easily without issue.
As far as being waterproof, they're good enough for anything except the really wet days. If you're going over big puddles it seems that water can splash upwards into regular (summer) road shoes. On days with light rain, steady mist, and gentle showers they have been excellent and kept my feet dry.