Castelli nano light pro bibshortsdesigned to wear on your spring training rides nano light is at the cutting edge of fabric technology nano light is just like nano flex but without the fleece lining we go into the science in more detail below but the result is that nano light actively repels water to keep you drier for longer nano light is coated with millions of microscopic nanofilaments this nanotechnology treatment causes water to bead and run off seams have been minimised to keep wat