100% Polyester. Detachable Sleeves turn it into a sports vest. Water-resistant, Windproof.【★Friendly Remind★】If you prefer loose comfort, please order a size up than normal./Zipper closure【Detachable Sleeves】This baleaf cycling jackets for men has zip-off sleeves and shoulder yoke easily convert the jacket into a vest for extra exhaust. It can turn to running vest sleeveless jacket in summer, perfectly used all year round.【Lightweight & Windproof Fabric】The running jacket for men is made of super lightweight fabric with great wind protection. Ventilation system in the back keeps you cool and dry.【Utility Pockets & Packable】The convertibele summer cycling windbreaker for men has one large back pocket and two hand pockets with zippers, which can securely store your items like 5.5" mobile phone. You can also pack it into back pocket for easy carry.【Reflective Elements】 The fluorescent color is very bright, high visibility. Some reflective elements on the front and back keep you visible in low light.【Multi-purpose】BALEAF men's detachable sleeves jacket is breathable, lightweight, windproof, water-resistant and packable, suitable for biking, running, hiking, golf, motorcycle riding or other outdoor sports.