Castelli head thingythe castelli head thingy can be used as a neck warmer headband facemask sun shield head bandana or even a helmet liner its actually all of the above so you decide its just the right weight for spring and summer use featuresmaterial 78 polyester 22 elastanetubular polyester knit constructionall over printlightweight for springsummer wearbuy castelli clothing from chain reaction cycles the worlds largest online bike store