First thing you notice out of the packet is how soft the material is, it feels like a cross between an arm warmer and neoprene. The second thing is that the overshoes have a double cuff. A super thin neoprene one and then an outer one made of the No Rain material.
So far I'm yet to use them in really shitty weather so I can't comment on how waterproof they are. What I can say is that in light showers and through puddles they have performed superbly. A full more in depth review once I've had some fowl weather.