General cycling advice ( NOT technical ! )
Here in our mucky Devon lanes overshoes are an essential daily wear item from about mid October to April. For a number of years I've been using Ozzo neoprene - as much for the insulation as the waterproofing. Yes, they fall to bits after a season's wear, so are more or less a disposable item. But on the credit side, they noticeably extend the life of your cycling shoes, they make it unnecessary to buy a separate pair of winter cycling boots , and they're not expensive. Worth every penny, as far as I'm concerned.