The new Brad Breathe II locks in place on both ends, so for those of you who are highly active there is no longer a chance for the underarm stabilizer to unhook itself behind your shoulder! The new Brad Breathe II can be used with the following BlackRapid Camera Slings: Sport Breathe (361005), Sport Breathe Left (361006), Curve Breathe (361007 and 481005), and Hybrid Breathe (361009). And for these harness models when they are used as a single camera sling: Double Breathe (361003) and Double Breathe Slim (361004).