Carrie Coon is wearing a pair of L.G.R Manda Explorer sunglasses in The White Lotus Season 3 (2025).
The L.G.R sunglasses have a black frame with tortoise arms and can be spotted in Episode 1 and possibly more episodes of Season 3 of The White Lotus. In the first episode, Carrie Coon wears them on the boat during the arrival at the resort in Thailand.
There are quite a few L.G.R sunglasses in The White Lotus (and other movies and series), see an overview here.
For all White Lotus Season 3 sunglasses, check the Ultimate Guide.
In the series, Carrie Coon plays Laurie Duffy, a corporate lawyer and recent divorcée from New York, one of three longtime friends reuniting on a girls' trip.
Reference: L.G.R Manda Explorer, Black Matt / Havana Tartarugato Matt 23B / Green G15-5