There is a Breitling indentation folding flap on the bracelet to prevent accidental opening of the unfolding buckle. Interestingly, it also has a built-in extension. These are most commonly found in diver's watches so that the watch can be worn in a diver suit. Obviously only 30m of water resistance is irrelevant here. Maybe it is included to make it easier to wear the watch on the pilot’s suit. By the way: Even if I am not a diver or a pilot, I still think these extensions are useful. I found that it allows my friends and family to try my watch on an average-sized wrist, even if the size of the watch fits my 6.5-inch wrist. Is it just me?