Bontrager's Interchange Nebula Fenders are genius. After you install them for the first time, they go on/off without tools in seconds. Raining in the morning? Pop 'em on. Sunny on the way home? Take them off. They're made of a light and super-durable polycarbonate material with adjustable, oversize-aluminum stays for a custom and secure fit. They also include impressive mudflaps front and rear to stop wheelspray. The rear fender fits under a rack, and stays out of the way of bags and panniers. What's more, should you ever wear them out, these fine fenders are completely recyclable.