The Cool Bottle

Nature has provided humans with an unmatched ability to cool ourselves to enable high levels of performance for a long period of time. The natural circulatory system cycles heat from the core of our bodies to the surface, leveraging highly vascularized areas with our natural blood flow to transfer excess metabolic heat to the environment. When it’s hot or humid, our body can’t do this fast enough, and we start sweating. When the sweat doesn’t evaporate fast enough and our bodies keep building up heat, we either slow down (bad) or overheat (very bad!). The energy locked in melting ice – which is about 5x as much cooling as ice water can provide – is used to extract this excess heat from an area that your body naturally uses to remove heat! The cooled down blood flowing through your veins then returns to your core, where it absorbs more heat and continues the cycle.

In testing, heart rates up to 7 BPM lower, and core body temperatures of 0.5°C cooler were observed over a 45 minute high temperature time trial. Think of how much training you would have to do to reduce your HR by 7 BPM at the same power output!!