The Cancer Council ACT's SunSmart Schools Program does not recommend wearing hats under helmets. Hats under helmets may interfere with peripheral vision and reduce external noise, two important elements to riding safely. To reduce the risk of over-exposure to harmful UV rays when riding, school bike riding activities and events should be minimised, when possible, between 11am and 3pm during Terms 1 and 4. Always use shade if it is available, wear sensible clothing that covers skin and apply sunscreen to reduce the risk of sun damage when riding. Riders may also consider fitting a UV protective cover to their helmet.