Gentex HGU-55/P Flight Helmet With MBU-12 Mask & Smoke Lens Size Large USAF USN Aug 1, 2020 gentex Gentex HGU-55/P Flight Helmet. Size: No size marked on the shell, but fits like a size large. Mask is marked extra long. Color: Grey / Black. Extra Info: Will come exactly as shown. Smoke Visor Lens, ...