Design Philosophy A jacket that blurs the lines between on-bike performance and functional street wear, the Flipjack deploys Primaloft® Silver insulation for unrivalled lightweight warmth and a reversable construction for increased versatility. Primaloft® Insulation Primaloft® insulation boasts an exceptional warmth to weight ratio, tiny pack size, extremely breathable construction and is highly water resistant making it a tremendously versatile performance insulator.