SL Series Sleek Shell Cap Style SL Series Sleek Shell Cap Style Cooling Traditional styling has been enhanced Size:13" Traditional styling has been enhanced with five raised channels running across the top of the helmet which not only modernizes the aesthetic look easy insertion and maximum all day comfort Size and shape fits most ear canals Traditional flared shape for easy removal Smooth closed cell outer layer that prevents debris build up Soft and comfortable PowerSoft™ foam supports long term comfort Metal detectable (blue) recommended for use in the food industry NRR 33 protection Offers impact and penetration resistance Custom imprinting available