The WRSI Current Helmet is designed to provide maximum safety for whitewater kayakers, rafters and canoeists. The Current has redefined paddling helmets by introducing advanced safety technologies in a package the everyday boater can afford. WRSI stands for Whitewater Research and Safety Institute, an organization founded to advance whitewater safety awareness and technology. Shell material: ABS plastic with a poyurethane sub-shell. Liner material: removable, replaceable padded liner. Vented: yes. Adjustment: interconnect retention system. Ear coverage: no.