The Atomic 4.0 represents Joe Rocket’s focus on ride friendly details. It features a resistant RockTex 600 outer shell, externally adjustable CE-rated shoulder and elbow armor, and a removable spine protector for safety. The Atomic 4.0 also boasts an excellent ability to adjust to the environment with its Variable Flow/Cross-Linked ventilation system while remaining 100 percent waterproof, and it includes a removable full sleeve liner for those colder rides.