Ray-Ban 4089 Balorama - Jodie Foster - Nyad
The Ray-Ban Balorama sunglasses worn by Jodie Foster have black frame, two rivets on the each side on the front of the frame, and two round rivets on each of the temples, just before the Ray-Ban logo.
The glasses worn by Foster seem to have photohromatic lenses, which means the lenses get darker when the light gets brighter.
Note that the glasses are sometimes offered in different sizes (58mm and the larger but standard 62mm) so make sure to get the right size for you.
Complete the look
Jodie Foster also wears a Casio Baby-G watch in the film.
Reference: Ray-Ban Balorama RB4089, black frame