This contemporary combination of a long sleeve t-shirt and sweatpants is very versatile and really up for whatever adventure you may find yourself on. Complete your outfit with black athletic shoes for maximum impact. And if we're talking style tips for teenage guys, this ensemble is a good look on most guys.
If you're hunting for a modern casual but also seriously stylish ensemble, marry a long sleeve t-shirt with sweatpants. Throw in white athletic shoes and off you go looking killer. Men who wonder how to sport modern off-duty style as you progress through your teenage years, this combo should answer your question.