A whole new classification of product. The Chest Protector 4.5 Hydra combines real chest and back protection with a backpack and hydration system that harnesses securely, comfortably, to your body. Not a cheap roost guard, but impact tested and CE certified chest and back protectors tested to the highest levels of impact protection! Harness the system on your body for a secure fit, then use the quick-adjust straps to attach the front chest plate where it fits you best. The front chest plate wraps farther around your flanks than other chest protectors offering you enhanced flank protection. The backpack harness system help keep the full backpack from bouncing around, or slamming into, your back while riding. The backpack itself features our top of the line CleanTech 3 liter bladder, with quick detach hose, and rests in an insulated compartment. It also has pockets and compartment for virtually anything you need for a long ride. Great front vented is coupled with ribbed AirLine air channels and mesh to help keep you cool on even the hottest of days.