The S-Works Carbon Rib Cage III uses a split design to strike the perfect balance between bottle hold and ease of entry/exit. It also happens to look drop-dead sexy. 100% FACT carbon construction for the perfect balance of strength, optimal botle retention, and light overall weight. Tuned compression design provides secure bottle retention with easy in-and-out accessibility. Super-low bottle position improves the aerodynamic profile. Weight: 24g