Zipper closure The cycling jersey short sleeves shirt is suitable for professional athletic training.It is close-fitting, the high-elastic fabric improve aerodynamic effect and reduce the wind resistance.If you want to be more relaxed, we recommend choosing size up. The side fabric is elastic and breathable which could provide good ventilation and keep you comfortable during the riding. Non-slip webbing on the hem to prevent the clothes from slipping. Top quality zipper. 3 pockets at the back, you can put wallet??water??cellphone ect??provide an ample storage options for the wearer. This athletic shirts are great for all sports,athletic, training, gym exercises, running, cycling, riding or outdoor activities and as your casual wear. SIZE TIPS: Please check size chart in our picture (Try reference with weight/height).If you have doubt for size, please send message to us. (Email: firstname.lastname@example.org) There are many kind of cycling clothes in our Amazon store, please focus on our brand CATENA in search bar, where will show all.