Micro-volume chest protection. Engineered for racing applications.. It\'s your final layer outershell. Created to give you that minimum chest protection on long fast descents. Ideally suited for racing and or training in hotSummer conditions.. In winter, early morning or late afternoon training rides, use it permanently for its reflective security and added insulation.. The emergency shellVest has been designed to contour to your upper body and provide a quick and easy-to-wear solution in racing conditions (putting it on while riding). Everything but the the absolutely essential has been eliminated to provide a piece of super functional, micro-volume cycling equipment.. For long fast descents (racing chest protection) and or permanently in winter training rides or in low-light conditions for added security due to the reflective appliques. Another little ASSOS invention that makes a big difference. Supercompact, we recommend storing it permanently on your bike in either the second waterbottle holder (inside a used half-cut waterbottle) or inside the saddle pocket.