After finding a pair of TCX X-FIVE.4 boots on sale, I went ahead and gave them a shot. Got them yesterday. They are a bit on the loose side, size 48s, while I wear a size US 13 EE, but that looseness allows me to wear heavy winter socks without issue. Only worn them around the house so far and they seem warm for summer, but we'll see when I finally get out and ride with them. If I stick with them, I'll also invest in TCX's Clima 2 Surround's for summer riding.