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. The Endurance Pro features an ultra-light Breitlight® case, a robust material 3.3 times lighter than titanium and 5.8 times lighter than stainless steel. Non-magnetic, thermally stable and hypoallergenic, Breitlight® is highly resistant to scratches, traction and corrosion. It also has a feel that is warmer than metal and a slightly textured effect, accentuating the originality of the design. Exclusive to Breitling, the material is 100-percent Swiss-made. In 44 mm or 38 mm, the Endurance Pro is available to athletes with a multitude of colourful dials and rubber straps all fitting a Breitlight® tang-type buckle. The two sizes are respectively powered by Breitling’s Caliber 82 and 83, both COSC-certified SuperQuartz™ chronographs delivering exceptional precision.
Size Guide
Choosing the perfect ring size is an essential part of the Hardy Brothers experience.
Our guide below will help you find the most accurate fit, ensuring comfort, elegance, and a seamless expression of luxury.
Australian Size | Inside Circumference (mm) |
---|---|
H | 46.0 |
H ½ | 46.6 |
I | 47.2 |
I ½ | 47.9 |
J | 48.3 |
J ½ | 49.3 |
K | 49.6 |
K ½ | 50.3 |
L | 50.5 |
L ½ | 51.5 |
M | 51.8 |
M ½ | 52.5 |
N | 53.1 |
N ½ | 53.8 |
O | 54.5 |
O ½ | 54.8 |
P | 55.7 |
P ½ | 56.4 |
Q | 57.1 |
Q ½ | 57.6 |
R | 58.4 |
R ½ | 59.1 |
For the most precise fit, we invite you to visit a Hardy Brothers boutique where our specialists will personally measure your finger and ensure your chosen piece is crafted to perfection.

Hardy Brothers uses standard Australian ring sizes.
Australian Size | Inside Circumference(mm) |
M 1/2 | 55.7 |
N | 57.0 |
N 1/2 | 58.3 |
O | 59.6 |
O 1/2 | 60.9 |
P | 62.2 |
P 1/2 | 63.5 |

This timepiece sizing guide is the combined length of the two straps. To determine the length of your watch band, follow the below.
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Cut out the length chart
Cut out the length chart
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Measure your wrist
Measure your wrist
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Subtract the case size of the timepiece from your wrist measurement
Subtract the case size of the timepiece from your wrist measurement
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Be sure to print this guide at 100%
Measure this box to check accuracy


Ask about Breitling Endurance Pro Quartz Chronograph Breightlight 44mm Watch X82310281B1S2