As a triathlete and runner who utilizes heart rate based periodization training, I was very interested in reviewing the LifeBEAM Smart Hat. As workouts are prescribed based on training zones, athletes need a reliable source of gathering heart rate data during the session. For years I used a Garmin chest strap, which is generally considered to be the best measure of heart rate data. However, the downside of a chest strap is that it can chafe the skin, causing redness, soreness, pain, and broken skin. Fortunately for those of us who battle with chafing, products with optical sensors are becoming increasingly popular and there is a fair variety to choose from. The downside of optical sensors has always been their tendency to be inaccurate at times, when compared to a chest strap. Dips, surges in heart rate, and high or low readings tend to happen occasionally, which can be frustrating when the numbers don’t match your rate of perceived exertion.