When the highest level of coverage is required, Armor B&S D3O® inserts protect your back and shoulders without impeding freedom of movement. Made from lightweight Stretch Mesh, Bluegrass Armor B&S is designed to maximize breathability, ventilation and quick drying. Unlike many other protectors, the Armor B&S D3O® is compatible with water bags up to 1L. Convenient solution to maintain constant hydration throughout the ride.