I have these. This is my second or third winter (can't remember) with them. The new Sidi boots have Gore-Tex and neoprene and are over $300 I think and look like they might offer more protection and warmth.

These boots do work for me. I usually wear 42.5 in Sidi shoes and I got a 43 so I can wear one pair of heavy socks and one thin pair of socks. Still plenty of toe wiggle room and air circulation. I can also fit a chemical toe warmer in there too. Because of the higher top it really keeps the cold air out of the shoe. I ride in temps down to 30 degrees and my toes still get a little icy at the lower end of the temp range. HTH.

Carol