The HGU-56/P Aircrew Integrated Helmet System (AIHS) is made of an advanced composite of graphite and Spectra (a high-performance polyethylene) and is available in six sizes to fit male and female crew members. The AIHS HGU-56/P is 15 to 20 percent lighter than the SPH-4 flight helmet it replaced.
The AIHS HGU-56/P includes:
• Communication Ear Plugs, fielded in 2002, which provide increased speech intelligibility and increased sound attenuation
• Maxillofacial Shield, fielded in 2003, which provides fragmentation protection to the face