'Pioggia' is the Italian word for 'rain' and that tells you what these overshoes are all about. They're made from a polyurethane-coated fabric that won't let water through. And when I say that it won't let water through, it really won't. I scrunched one of these up and left a pool or tap water in the fabric and it was still there a day later. Of course, that's not real-world testing but, believe me, water doesn't soak through here.
Pro’s entry level Blaze strike a near perfect balance between performance and value for money but they’re best saved for the depths of winter as milder conditions can leave feet feeling boiled in the bag. Being Shimano offshoots, standards are very high. Relatively thick 2mm neoprene and slender profile pretty much rules out compatibility with anything bar competition road/performance mtb shoes, although some sport touring models might be ok.