1. Anti-fouling and water resistance material, which is easy to clean. 2. Slim body design with large capacity to minimize the resistance from wind 4. Bag with zipper available to carry more of your belongings that are vital to your riding- Phone, first aid, flashlight, cycling sunglasses or glasses, purse, power bank and so on 5. Big zippered opening mouth design for easy access, with durable zipper closure 6. Velcro straps provide you a secure and durable riding experience.Your knees won't hit it while riding. Besides, it's easy to install and remove. 7.It's suitable for a variety of Bicycles ( Such as fast riding bike, road bike, mountain bike and so on ).