Size option Size Problem!!! It is often the buyer who does not look at the size chart to select the size.Please measure your CHEST and choose the size of for your chest range.If you are a thin person, please pay attention to the length. Jersey details Neckline Detail Fashion simple design collar, generous, reduce friction caused by riding Zipper Using self-locking zipper, smooth non-card chain, does not automatically open when you Cycling Cuff Lycra fabric for sleeve,slightweight and moisture-wicking. Side Net Sector mesh makes your body more breathable Skid strip Clothes lengthened design, coupled with high-quality non-slip tape, more comfortable Cycling experience Pocket Details After the bag with three large-capacity pocket design, so you can store some small things when you Cycling