WINTERIZED RUNNING SHOES FOR YOUR BEST COLD-WEATHER RUN. When the weather turns cold and wet, you still owe it to yourself to get out there. These adidas Ultraboost 21 COLD.RDY Shoes make it easier. The insulated upper sheds water to keep your feet warm and dry. A Continental™ WinterGrip™ Rubber outsole keeps your footing secure on steep downhills and slippery stairs. Responsive Boost cushioning gives you an energized feeling that reminds you that you can always go one more step, maybe one more block or perhaps another mile. I wore these a few times but they are a little too small.