Which product of modern technology has helped professional swimmers improve their racing performance?

One significant product of modern technology that has helped professional swimmers improve their racing performance is the use of high-tech swimsuits, such as those made from water-repellent materials and designed with advanced hydrodynamic features. These swimsuits reduce drag and enhance buoyancy, allowing swimmers to glide more efficiently through the water. Additionally, wearable technology like swim watches and heart rate monitors provides real-time feedback on performance metrics, enabling athletes to fine-tune their training and racing strategies.