Dynafit Race Thermo Bottle

According to the International Journal for Clinical and Experimental Medicine (Hosseinlou et al., 2013), 16 degrees Celsius (~ 60 F) water is the most efficient temperature for rehydration - hotter, and you lose water through sweat; colder, and your body loses energy to warm up the water. Thanks to Dynafit's Race Thermo Bottle, you can keep your water at this perfect temperature for optimal hydration. Or not - it's your choice - but whatever you pick, the bottle is designed to keep it at that temp, which is especially convenient when running in freezing temps or blistering heat. An insulated bottle like this one is imperative to keeping your hydration fuel from becoming uncomfortably hot or cold (or frozen). With a 620 mL capacity, twist-closure spout, and 108g empty weight, the Race Thermo Bottle is a must-bring for missions, no matter what the weather is doing.