ArmorSource ACH Lightweight Level IIIA U.S. Army Next Generation Advanced Combat Helmet. The Lightest in the Field. FULLY-LOADED HIGH-CUT NOMINAL WEIGHT Medium 2.4 lbs. / 1.11 Kg; Large 2.6 lbs. / 1.17 Kg; X-Large 2.7 lbs. / 1.21 Kg For SMALL, please select medium The ArmorSource ACH Lightweight Level IIIA Aire II is a premium ballistic head protection system. Previously named 'AS-501 Gen II', this is the lightest version of the U.S. Army ACH. The Aire II reduces traditional ACH weight by over 30% and LW-ACH weight by 15%. It exceeds ballistic protection for the Lightweight ACH category using proprietary materials. This system provides tactical operators with a significant reduction in physical fatigue. Engineered for versatility, it integrates seamlessly with modern modular communication gear. The ballistic shell utilizes a high-tenacity composite matrix for maximum energy absorption. Operators benefit from enhanced agility during high-intensity missions without compromising safety. Advanced engineering allows for superior durability during deployments in harsh environments. The streamlined profile facilitates better movement through tight spaces and dense vegetation. This tactical solution balances lightweight construction with uncompromising armor integrity. Field-proven design ensures mission success for military and law enforcement personnel. ArmorSource ACH Lightweight Level IIIA Features: Provides extremely high ballistic protection against fragments and handgun projectiles. Extremely comfortable due to its light weight and flexible pad system. Utilizes industry leading ballistic technology. Utilizes the ACH/MICH shape used by military organizations worldwide. Available in Bolted and Boltless Versions. Compatible with all ACH accessories and Devices. Proudly made in the USA. The helmet shell is designed to maximize situational awareness without sacrificing coverage. Each unit undergoes rigorous batch testing to ensure consistent performance. This lightweight design is ideal for long-duration wear in diverse conditions. Advanced manufacturing processes ensure every component meets strict quality standards. The system supports a wide array of night vision devices and accessory rails. DOWNLOAD DATASHEET PDF Aire II Ballistic SHELL High Cut Shell Velcro Bungee M-Lock AireRail or ARC Rail System AireMount NVG Shroud AireSupport MAX Cushion System AireLink Prime Rentention System All Helmets Are Custom Made to Order. 5 Week Estimated Lead Time. PISTOL THREATS DEFEATED Weapon Ammunition STRIKINGVELOCITY ft/s STRIKINGVELOCITY m/s 9mm 50-grain USM4 2490 759 9mm Fiocchi, 115-grain FMJ 1540 469 9mm 124-grain Hydra-Shok JHP 1230 375 9mm 124-grain FMJ 1425 434 9mm 124-grain FMJ Steel 1262 385 .357 100-grain Frangible SF 1774 533 .357 115-grain JHP 1645 501 .357 125-grain SIG FMJ FN 1476 450 .357 125-grain GDHP 1454 443 .40-cal 95-grain S&W HP 1697 517 .40-cal 115-grain S&W JHP 1249 381 .40-cal 180-grain S&W JHP 1098 335 .44 Magnum 240-grain SJHP 1412 430 Sizing the ArmorSource ACH Lightweight Level IIIA Getting the right fit for your ArmorSource ACH Lightweight Level IIIA is important for performance. The wearer MUST be seated upright for proper fitting. Use a tape measure to take points. Correct measurement ensures the suspension system stabilizes the shell during rapid movement. Proper alignment with the brow and ears is critical for maintaining a full field of vision. Consult the sizing table below to match your physical measurements with the correct shell size. Check for a secure fit that limits shifting while providing comfort across contact points. Adjust the retention system straps uniformly to ensure balanced pressure around the head. Ensure the nape pad is positioned correctly to support the back of the skull during activity. Accurate sizing facilitates maximum impact protection and prevents helmet rotation during use. Users should re-evaluate fit after adding accessories like headsets or optics for stability. NOTE: If any measurement falls on the line, select the larger size. Small UP TO 7¼" / 184 mm Length UP TO 6½" / 162 mm Width UP TO 21¼" / 538 mm Circumference Medium 7¼" / 184 mm to 7¾" / 198 mm Length UP TO 6½" / 162 mm Width 21¼" / 538 mm to 22½" / 573 mm Circumference Large 7¾" / 198 mm to 8¼" / 210 mm Length UP TO 6½" / 162 mm Width 22½" / 573 mm to 23½"/ 597 mm Circumference Extra-Large 8¼" / 210 mm and over Length 6½" / 162 mm and over Width 23½"/ 597 mm and over Circumference