Series K Helmet provides ability to convert all David Clark "Over-The-Head" style headsets (except H20-10 and H10-80) into a Helmet/Headset assembly. The Kit and a David Clark headset gives both impact and hearing protection in addition to clear, normal conversation in high noise environments. The Series K Helmet Kit consists of a helmet shell with nape pad and a helmet liner. Lightweight, the combined weight of the Helmet/Headset assembly is 42 oz.