The Joe Rocket Atomic 4.0 Jacket combines waterproof protection with the Variable Flow ventilation system and included armor.; ; Rock Tex 600 outer shell 100% waterproof CE rated protectors in shoulders and elbows Removable spine pad with pocket for optional CE spine protector Variable Flow ventilation system with waterproof zippers Cross Linked Ventilation with wind tunnel cooling Sure Fit adjustable waistband Elastic sleeve adjusters Snap loops for attaching jacket to belt Removable insulated full sleeve liner Reflective stripe