Get ready to experience our Best Fit Yet, with our Predator Flex Polarised Ultra Reactor swimming goggles. The Polarised Ultra Reactor Photochromic lenses react to the sun’s rays, colour changing for a darker and more protective tint in brighter conditions, and complete clarity in darker settings.,Get ready to experience our Best Fit Yet, with our Predator Flex Polarised Ultra Reactor swimming goggles. The Polarised Ultra Reactor Photochromic lenses react to the sun’s rays, changing colour for a darker and more protective tint in brighter conditions, and complete clarity in darker settings. They make the perfect partner for long open water swims with changing light conditions, or a regular training session at your local pool.