Please choose your size:this is asian size,it may be smaller, it is recommended to buy a larger size. Such as,if you measure it to fit m, it is recommended to buy l. Stereocut fit: the rockbros winter cycling jersey uses stereocutting technology and elastic fabric to closely follow body contours. It allows full freedom of movement and a comfortable fit during cycling, enhancing the overall riding experience. Double-layer function: featuring a double-layer design with a full-length zipper, the outer layer blocks cold wind, while the inner fleece retains heat. The zipper allows adjustable ventilation for different temperature conditions. Fleece lining warmth: the soft inner fleece lining provides gentle touch against the skin and excellent insulation, keeping riders warm and comfortable in cold weather. Wind-resistant fabric: the high-density nylon outer fabric is windproof yet breathable, maintaining smooth cycling motion without restriction. Multiple pockets: three back pockets and additional side pockets offer convenient storage for essentials like phones, gloves, and energy bars. Safety & reflective design: reflective elements on the jersey enhance visibility for night rides, ensuring safety. Comfort & flexibility: 15% spandex ensures high elasticity, snug fit, and freedom of movement, making long rides comfortable. Ideal temperature: suitable for 15 25 c 59 77 f , perfect for autumn and winter cycling.