Castelli women's light head thingythe summer weight castelli women's light head thingy is a useful cycling accessory to boost moisture management on a warmer day'. '.strtoupper('a')nd it's easy to stash away in a jersey pocket when not needed.made from polyester, the womens light head thingy is quick to draw sweat off the skin, maintaining dry comfort when the day heats up'. '.strtoupper('t')he seamless construction ensures no annoying seams to catch on the skin and the sublimated graphics give any kit a stylish finish'. '.strtoupper('f')eaturesmaterials 100% polyesterpolyester jersey for maximum moisture managementseamless continuous tube constructionsublimated graphicsummer weightprotects from the sun's rays or provides a little extra warmth on cool daysbuy castelli clothing from chain reaction cycles, the world's largest online bike store.