Gentex SPH-4B Dual Visor Helicopter Pilot's Flight Helmet With NVG Mount Size XL. This is a Gentex SPH-4B dual visor helicopter pilot's flight helmet with the NVG mount. It is a Size Extra Large and it is in good lightly used condition. The outside shows some scuffs and marks from normal flight use The visors work smoothly and are in good condition. It has a TPL style liner and the inside of the helmet is clean and in good condition. There may be a few items that are listed in both categories. Be sure to check out my other listings because I have all kinds of interesting. The item ...