This is the deluxe collector's edition tin box version. "Traou Mad" means "Choses Bonnes" (things good) in Breton, the (official) language of Brittany. Without going into the details of what's in those galettes (let's just mention salted butter, the main ingredient in fine "cuisine bretonne"), you may want to consume in moderation. No need to go to Pont-Aven to get them since they're available in all fine French "grandes surfaces" like Leclerc, Auchan, etc. It's hard to describe how they taste but, first, they are of the crumbly kind and, second, the combination of salted butter and sugar is kinda right on.
On the face of the cookie, it says "Traou Mad" and above it, there's the symbol of Brittany: the ermine (winter coat of the stoat).
The "galettes de Pont-Aven" are so famous they made a movie of the same name in the 70s (but has nothing to do with cookies).