Ask Nasa. The Execs' high-grade, durable plastic lenses are covered in the same multi-layer film lens coatings which enhance and protect Nasa space equipment. This makes them endearingly scratch-resistant, but more importantly they filter out potentially damaging UV, infra-red and short- wave blue light. Nasa tests show they cut out 99 per cent of polarised glare. Good health sense when you consider that excessive exposure can lead to cataracts and retina damage.
They also offer enhanced clarity, depth perception and lack of distortion under differing light conditions: in other words, you can see better through them than you would through those fake Ray Bans.
But what about style? Well, we think they're chic in a kind of "I've just finished a double triathlon" sort of way, but it really depends on whether you like lightweight aluminium frames and space-age blue/purple reflective lenses.
Well, do you?