The Drankful Adults' Adventure Pack Hydration Cycling Vest helps you move fast and smooth through any terrain. The multiple cinch straps help keep the water bladder tight and secure to your body for your comfort, and the air mesh shoulder straps and panels get rid of moisture and promote airflow. The back shell fabric is waterproof to help you and your items inside stay dry, and the vest is designed to make sure that you barely even feel the bladder when you are cycling through uneven terrain and elevation changes.