Tabs ContainerOverviewUnder-helmet anti "surfer's-ear" cap. Keeps your head warm and helps reduce water rush into the ears which can result in Multiple Exostoses of the ear canal. Unlike other designs our unique "cinched" ear panels enclose the whole ear. Specifications1mm neoprene super-stretchy when wet. Yamamoto Titanium heat reflective neoprene. Two sizes are available SML and XL.