In south Louisiana, we canoe year-round. This morning it was about 50 degrees when I left at 7am. My boats are wet foot entry. Despite my neoprene boots, NRS Desperados, when I returned 2.5 hours later, the whole front half of each foot was numb. Loaded the boat on the van, drove 3/4 mile home, went inside - still numb. My feet were so cold that my tile bathroom floor, which generally feels like I'm standing on an iceberg, felt warm. Even after a shower, the tips of my toes were still tingly. How do you guys keep your feet warm?