Not just for winter. Yes, Castelli do some fabulous winter hats (the Viva Thermo skully is a 3 season essential) and we have always done a range of cotton caps for the traditionalist but what you might not realise is we have every base covered from Windstopper® balaclavas to specialist summer skull caps designed to aid cooling and absorb sweat (essential under a TT helmet), even some stylish off the bike offerings too.