Ultimate Direction Thunderbolt Race Belt (3) 10oz/.3L Bottles and 4oz/118mL Gel Flask Included Weight 8.5oz/241g Small zippered storage pocket External binding made of soft, durable stretch fabric to provide extreme flexibility while preventing skin irritation 3D AirMesh body panel for optimal breathability Redesigned mesh holder makes it easier to slide the 4oz gel flask in and out Adjustable Velcro waist belt closure Reflective logos and piping