Proven aerodynamically invisible by 5x WORLD CHAMPION Craig Alexander & Mat Steinmetz at the Velodrome, June 2013. Computational Fluid Dynamic (CFD) airflow optimized and velodrome aero testing approved. Bottle body design Contoured design to fit your arm shape. Small frontal area that allows a clean airflow around the bottle. Kamm tail. Reduces drag by 50% Airflow straighteners designed into the bottle to gather airflow for a clean, straight exit air flow. Flush lids reduce drag. Spacers - allows you to adjust the bottle to the height of your arms resulting in zero crosswind drag. Dolphin tail designed straw retainer - allows you to fold the straw flat. Directs air over the straw. Saves up to 100 grams of straw drag. Computer mounted in front of the bottle, not on top which increases aero drag.