Breitling Professional Endurance Pro 38 White X83310A71B1S1. Designed to be both a lightweight timepiece for athletes and a casual, everyday sports chronograph, the Endurance Pro perfectly blends innovative technology with a vibrant design to produce the ultimate athleisure watch. Designed for men and women whose active lives combine a professional mindset with a sporty lifestyle, the Endurance Pro is up to the challenges of a rigorous workout, but fashionable enough for everyday wear.