Castelli Converter Cap First off this isn't a cap basically this is a tube of soft fleece with a toggle & drawcord closure at one end. It makes a great neck & face warmer in cold conditions & can be worn as a hat with the toggle done up (Warning: it wont fit under your helmet) The reversible colourways means you can choose safety or discreet style with just the one garment. Unisize too makes this an ideal gift for cycling friends & family. Castelli Converter Cap, An old school cycling classic ideal as a winter cycling hat for non helmet wearers, & a neck warmer for all. Black or black/red on one side both with Fluo yellow insides.