Castelli Nano Shoe Cover
I returned these after about 10 winter rides. They started to de-laminate after about the 5th ride. it wasn't long after that an entire section of laminate peeled right off. I wear a 44 shoe so I ordered the large. Maybe this wouldn't have happened with an XL? They look great and are effective down to about the high 30's. Below that, my toes would get really cold.