"Seb Stan long hair" refers to the hairstyle worn by actor and model Sebastian Stan, known for his roles in the Marvel Cinematic Universe and other films. The look consists of Stan's hair grown out to a length that falls past his shoulders, usually styled in loose waves or curls.
Stan's long hair has become a defining characteristic of his public persona, adding to his charm and rugged appeal. It has also contributed to his success in portraying characters with a more romantic and artistic flair. Notably, Stan's long hair was a significant part of his portrayal of Bucky Barnes, aka the Winter Soldier, in the Marvel films.