The Chartreux is a study in contrasts. Often described as a "potato on toothpicks," the Chartreux has a robust body, broad shoulders and a deep chest, all complemented by medium short, finely boned legs. The Chartreux is well muscled, which would enable the cat to meet its obligation as the fine mouser it is reputed to be in French literature. Unlike any other cat, the Chartreux's blue fur is medium in length and woolly, with the proper coat breaking at the neck, chest, and flanks. A dense undercoat gives it resistance and a feeling of sheep's wool.

Chartreux quickly become attached to one family and frequently follow their masters from room to room. Known for their dog-like behavior, these cats can be taught to fetch a ball, and most will respond to their names.

By tradition, all kittens born in a given year are named beginning with a specific letter of the alphabet for that particular year. Breeders use only 20 letters, omitting K, Q, W, X, Y and Z.