In the movie Men in Black Will Smith wears Ray-Ban RB 2030 Predator sunglasses. These Ray-Ban wrap frames can be seen in the movie, on the posters and are even mentioned in the Men in Black title song by Will Smith, as he sings "the black suits with the black Ray-Bans on".
Tommy Lee Jones wears the same sunglasses in this film, and in the sequel Men in Black II. Ray-Ban reported a huge increase in sales of these glasses due to the popularity of the movie.
The Predator glasses can be bought with Matte frame or Glossy frame.
Reference: Ray-Ban RB2026 and RB2030 Predator - Color: W3284 Glossy Black frame / G-15XLT lenses