Demonstrate your mellow side in a long sleeve t-shirt and black jeans. Take this outfit in a classier direction by finishing with brown suede chelsea boots. With a look like this in your winter collection, you'll manage to stay snug and look amazing despite the cold weather. This one is a good-looking yet age-appropriate combo for a 30-something gent.
This combination of a long sleeve t-shirt and black jeans makes for the ultimate casual style for any modern guy. Complement this outfit with a pair of dark brown leather chelsea boots to immediately amp up the wow factor of this ensemble. Dressing warmly is the trick to surviving subzero temps, but this look is a striking illustration that you can achieve this with style. Gentlemen who wonder how to rock modern casual style as you go into your 30s, this pairing should answer your question.