UONO Mens Outdoor MTB Mountain Bike shirt Cycling Short Sleeve Jersey Riding Clothing Polyester SIZE NOTICE: Chinese size 1 size smaller than US ,Eg,US size XS=our tag S Longer back hem for extra coverage Much perfect for cycling hiking etc. Three back pockets for storing small items,With Full Hidden zip Our jerseys are made of elastic microfiber polyester with microcells that allow for maximum breathability