A casquette keeps the sweat from running down your face. In winter it keeps your head warm and keeps rain off your face. It will extend the lifetime of the helmet liner pads and, in summer, it stops your nose from getting sunburnt and if you are bald (like me) or have a shaved head it saves you looking like...
Coincidentally, Phil Deeker has written a far better article on the advantages of wearing a cap all year round on the Rapha blog here - http://www.rapha.cc/a-doff-to-the-cap
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