The D3O Halo (Delta Three Oscar Halo™) Helmet Liner System is the lightest, most ventilated, comfortable helmet liner to exceed ACH Blunt Impact Requirements (AR/PD 10-2). Halo is 25% lighter, making it the lightest ACH 10fps suspension system, than the next best helmet liner on the market which means you can shed weight while reducing trauma. Designed with the end user comfort fit in mind with 37% pure comfort foam all this to guarantee the best-in-class short and long term comfort. The comfort foam has been scientifically developed to provide a familiar plush, full coverage fit and is wrapped in premium MILSPEC anti-microbial working fabrics. And it only comes in at 80g.