Guests use Ralph Lauren’s PoloTech shirts embedded with sensors that read real-time biometric data during a presentation in New York, August 20, 2015. The PoloTech shirt will measure heart rate and calories burned and streams the information to an iPhone app designed to generate a customized workout program. The Men's shirt will go on sale August 27 for $295 as part of the relaunch of Ralph Lauren’s Polo Sport line. REUTERS/Brendan McDermid