Breitling Watch Professional Endurance Pro Breilight Black X82310281B1S1. The ultimate Breitling quartz watch for professionals in their field, the Breitling Professional Endurance Pro is described as the definitive athleisure instrument promoted by the brand’s Breitling Triathlon Squad consisting of Iron Man World Champions Jan Froderno, Chris McCormack and Daniela Ryf. Alongside it’s advanced technology, the design is largely inspired by a 1970’s Breitling watch known as the Spring. This historic model was renowned for its lightweight resin case and pulsometer scale used by athletes to check their heart rate. In commemoration of this design, the Breitling Professional Endurance Pro Yellow features a striking pastel blue pulsometer scale around the circumference of the dial and an enhanced lightweight case made from Breitlight. The 44mm Breitling case of this Breitling Professional Endurance Pro watch is renowned for its lightweight properties, measuring in at 3.3. times lighter than titanium and 5.8 times lighter than steel. Its bi-directional bezel is engineered from the same, decorated with a compass scale and Superluminova accents. Housed within is the B82 SuperQuartz movement which has been COSC certified and provides exceptional precision of the hours, minutes and small seconds and chronograph function with 12 hour and 30 minute counters. Presenting all these useful functions is a smooth black dial decorated in pastel blue accents and Superluminova numerals and hands for optimal legibility. To complete the look of the Breitling Professional Endurance Pro Black watch, a sporty blue rubber strap is added alongside a Breitlight engineered double tang clasp.