If you want to feel confident in your look, dress in a turtleneck and navy sweatpants. When this ensemble looks too polished, tone it down by slipping into a pair of black and white work boots. In the winter months, when warmth is above all, it can be easy to settle for a less-than-stylish getup. But this getup is a shining example that you can actually stay cozy and remain stylish at the same time in the winter months. Ideal if you're on the hunt for some seriously inspiring style for 30-year-old guys.