This listing is for a New Genuine Gentex Helmet liner Energy Absorbing Liner SHOCK ABSORBING LINING Size: largeITEM # 8475-01-183-0543PN: D4239Foamed plastic molded to conform to the contour of the inside of a helmet shell. It is designed to be permanently installed in the helmet to afford increased protection to the head from impact. HIGH QUALITY This was made for the US military Large Quantity available Unit Weight: 1.5 lbsUnit Size: 10.8in x 8.5in x 6.5inUnit Pack Cube: 0.381 cu ftPlease see link below for more details. https://www.nsncenter.com/NSN/8475-01-183-0543