Polo shirts slim fit
Slim fit polos from Boss and Tommy Hilfiger are heavily tailored and therefore sit tighter to the body than regular fit polos. Slim fit means a narrow cut and is often worn by men with a slim build.
Also great under a sweater
Because the slim fit polo fits closely to the body, it's also great to wear under a sweater. This way you keep a sleek look without the polo bunching up under your sweat jacket or hoodie.