Prolimit adjustable helmet for water sports. Available in three adjustable sizes to make it easy for schools or equipment rentals. The size is clearly printed on the back of the helmet and, of course, on the inside as well. All helmets are CE/EN certified for use in water sports. They have a very comfortable soft foam lining and a rubber chin guard. Adjustment is very simple - just turn the solid dial on the back (ski/cycling/snowboard helmet style). Adjustable strap and noise-cancelling ear pads. Ventilated helmet shell.