Designed for travel when space is a concern. Includes compression storage bag. Cover is made with a 70D with polyurethane and mildew-resistant undercoating for enhanced water & mildew resistance. It’s not waterproof, but very close. Sewn-in vent allows moisture to escape. Elastic shock cord is sewn into the bottom of the cover to provide a snug fit. Plastic grommets allow the use of a cable to lock the cover to the bike. Two-year limited warranty