If you're looking for an off-duty but also seriously stylish ensemble, try pairing a blue crew-neck t-shirt with navy chinos. White canvas low top sneakers work wonderfully well here. During the winter season, when comfort is everything, it can be easy to settle for a less-than-stylish look. This look, however, is a striking example that you can actually stay snug and remain stylish at the same time during the winter season. Those who are curious how to rock cool casual style as you mature into your 30s, you have your answer.