Nikwax Washing & Proofing - Castelli use some of the best fabrics and technologies in the world, but if you don't look after them correctly they wont perform at there optimum. We recommend you wash all performance fabrics with Nikwax Tech Wash. In addition Castelli use DWR treatments on many items, these treatments enable a garment to bead water and remain breathable. However this DWR coating breaks down in time and needs reapplying from time to time. We recommend Nikwax TX Direct as the perfect product to restore your Gabba, Perfetto, Nano Flex or Windstopper garments showroom condition.