Callum Skinner, the British former track cyclist and Olympic medalist, is launching special sunglasses that allow cyclists to see also behind them. The glasses were invented by physicist Alexander Macdonald, developed with Skinner and designed by Bob Henderson, an award-winning optical engineer, after raising more than £100,000 (€115,35-$139,25) via a Kickstarter campaign. Skinner and Macdonald co-founded HindSight, of which Macdonald is the CEO. Riders can see forwards and backwards by shifting focus and without having to turn their head, thanks to the two-part angled lenses with semi-transparent mirrors in the specs. The patent-pending lens technology is supposed to make amateur and urban cycling safer. The HindSight Edge range comprises three sunglasses-style models suitable for daytime use. The first drop is scheduled for March 2021. Skinner earned a silver medal in the individual sprint at the 2016 Summer Olympics in Rio and a gold medal as a member of the British squad that won in the team sprint.