ROKA SL-1

£148.93 The SL-1 glasses from Texan brand Roka are great, for the most part. In this guise – matte silver frame and octane mirror lens – they’re ideal for the changeable light of the British spring and early summer. The lens provides clear, high-contrast views on overcast and cloudy days, and just enough shade to stop you squinting on bright and sunny days. There’s nothing to obstruct your view either as the frame is nothing more than the arms, so as far as your field of vision is concerned it’s non-existent. Coverage is impressive too, with the lens sitting so close to your face that your eyelashes brush against the back of it, which is reassuring if a little disconcerting when you’re running. Nevertheless, it’s difficult to recommend them for triathlon as the brow is a tiny bit too low, which becomes noticeable when you’re tucked over the aerobars. You’d be better off going for the taller SL-1x model from Roka instead. roka.com