The world's first concept football boot - the Nike Mercurial SL - goes supersonic as Asafa Powell trades in his spikes to test run the new Vapor SL soccer cleats... The Nike Mercurial SL is a 190g 100% carbon fibre football boot designed to be the lightest, fastest boot ever and created solely to cater for the fastest players on the planet, athletes including Didier Drogba and Cristiano Ronaldo.