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We also list where you can buy the different models, types of sunglasses and some hints for what features to look for when you are buying.
However, they have clearly not been downhill at 30mph in mid bug season and been peppered by a swarm of flies ! Its most unpleasant, especially if you wear contact lenses and if you shut your eyes at the wrong time you could end up as a cycling accident statistic, going at that speed.
Wearing sunglasses while cycling can also protect you from bits of flying grit or dirt, because of course you'll be travelling at speed if you are at all competitive in your riding. There is also the issue of wind causing you problems if its consistently blowing into your eyes while you're cycling; cycling sunglasses protect you against this as well.
Of course there is also some glare and the sun itself to protect against, probably more important to leisure and touring cyclists than when your head is down on the drops in competitive.
Also having interchangeable lenses allows you to keep one pair of sunglasses for use in both summer and winter and in changeable weather conditions.
Two key features are comfort and weight particularly if you are a long distance competitive cyclist.
Firstly comfort is somethingyou won't necessarily get with a standard pair of sunglasses, because they have to fit under your helmet without being pushed into your head in some awkward way.
The next thing is the weight. Most cycling sunglasses are already designed to be light so as to avoid any sort of fatigue or annoyance.
Its also worth checking what sort of adjustability is built into the design, such as the length and also whether the tightness / grip on your head can be varied.
You should also find that many of the top sunglasses have a variety of lenses available in packs that you can use to change the amount of protection you get. They are also likely to get scratched or damaged, so some spares are useful anyway.
Make sure you don't buy anything too dark though - its important to have maximum visibility if you're travelling at speed.
If you are mountain biking, which often involves frequent stops, starts, slow and fast sections, you'll need to have a look at the ventilation in the sunglasses as well. This is important to stop your glasses steaming up while competing; you need all the clarity of vision you can get to avoid those tree roots.