Featuresr the size is us size size is optionalchest measurement xschest 31 33in schest 33 35in mchest 35 375in lchest 375 40in xlchest 405 425inr quick dry function and make you feel more comfortabler unique mesh fabric under armpit for keeping drying and coolingr direct vent panels and full length zipper for ventilationr hem with wosawe logo silicone band can provent skin allergy and the cloth upgliding during ridingr 3 pockets at the back easy to carrying your smal