With the latest technology in waterproofing, Polartec NeoShell, this beanie keeps your head completely dry even in the heaviest of downpours but is plenty breathable to all but eliminate the dreadful "clamminess" that can come with waterproof beanies. - Fabric Content: 61% Nylon, 31% Polyester, 8% PU - Under helmet beanie design with perforations at ear position to help maintain auditory awareness. - Fully taped seams prevent water intrusion, keeping you dry and protected.