The castelli thermo head thingy is a very versatile neck warmer made with thermoflex fleece fabric for ultimate protection against the cold the castelli warmer can be worn as a neck warmer bandana or cap depending on the type of coverage you would like during your old weather rides keeping your energy and focus on your performance rather than how cold you are the castelli thermo head thingy features thermoflex fleece fabric can be used as neck warmer bandana or cap sublimation printed