While it may be the official end of Summer in 2 days, here in Adelaide the sun is hotter than ever and the UV index  is still very high to extreme. Many people want to keep themselves protected from the sun and will SLAP on a hat under their helmet as they head off for a ride… but this isn’t best practise. My opinion, as a professional cycling teacher is that a hat under your helmet is not the best way to protect yourself while cycling. 1) Helmets are designed with holes to aid air flow and cool the body…