Not everyone looks good rocking a baseball cap or a FAST/WENDY helmet so for a low-key head cover the Boonie does it all. The brim provides cover from the sun or deflects the rain. The top has a mesh vent to keep your noggin cool and there's a range of colours for all seasons, plus it's not twenty five quid like a certain Austrian brand. My head is a whopping 61cm diameter and this is just big enough. If your head is any bigger, lucky you but these won’t fit.