Cycling has long borrowed kit from other, more extreme disciplines. Scuba gave us neoprene, the aerospace industry gave us alloys and carbon, and with the Insulated Vest, Giro has optimized the Alpine athlete's favorite shell for use on two wheels. Whether it's spring commuting, fall trail riding, or mid winter fat biking, the Insulated Vest is the right weight for turning cranks. The Insulated Vest is made from a wind , rip , and abrasion resistant nylon shell that has also been given a DWR treatment to shed rain and road moisture. This outer armor protects 25 generous grams of Primaloft Sport, which uses a blend of large and small fibers to build a lofted structure and create insulating, water resistant micro pockets of trapped air. There's slightly less of it than you'd expect in a downhill jacket, so it's the right weight for a cycling application or even a Nordic dawn patrol in early spring. The collar is lined with a gentle tricot fabric, and the ingenious Stowback system a set of pockets within a pocket, providing extra protection for your personal effects while hiding them from view. You can transition from the bike the store without announcing yourself as a cyclist. Giro rounds the Insulated Vest's construction off with a few standards: hand warmer pockets, a drawcord waist, and a full length zipper.