Poc launched new Propel sunglasses with the claim that they are "the most aerodynamic cycling sunglasses Poc has ever produced", thanks in part to the addition of "side fairings" to the wrap-around lens - the better to help guide air away from the rider's ears.
With Poc itself being less than precise about the exact aero gains, I did my best to put the Propels through a rigorous testing programme and see how they stack up against our other best cycling glasses. But in terms of how many watts are actually saved, unfortunately I don't have any clearer a picture.
