The NEXUS ACH Helmet ( Advanced Combat Helmet ) is a newer and lighter version of the US Army’s MITCH (Modular Integrated Tactical Communications Helmet ). Designed as a lighter and more compact version, incorporating protruding ear coverage for Tactical Headsets and comms fits which offers a greater degree of ballistic protection. The reduced profile ( No Front Peak ) optimises peripheral vision and sensory awareness, with reduced coverage at the rear, which helps when in the prone position. FEATURES High ballistic performance with low weight, using high-tenacity ballistic aramid fibre and bound in a Thermoplastic resin matrix. SUSPENSION SYSTEM 4 point chin strap harness, with an integrated Crown Mesh with cross straps with plastic chin cup. SIZES SF Helmet has a fully adjustable Harness System. Head Size (CM) and Weights (lb.)   Size EURO (circumference) UK (circumference) USA (diameter) Weight Medium 54-59 cm 21-23 inch 6 5/8″ – 7 1/4″ 1.2Kg Large 56-64 cm 22-25 inch 7 1/4″ – 8″ 1.3Kg COLOURS TAN OLIVE GREEN BLACK BLUE BALLISTIC PROTECTION NIJ Level IIIA 9mm – 44 Magnum. V50 Fragmentation Rating up to 750 m/s; as tested with 1.1g, 22 Caliber, 17 grain Fragment Simulated Projectile, according to STANAG 2920 and US MIL STD 662F. Ballistic (National Institute of Justice)NIJ II 9mm FMJ and 357 Magnum JSP, in accordance with NIJ standard 0106.01. It has a V50 of 550 m/s (1800 ft/s). NIJ IIIA 9mm FMJ and 44 MagnumSJHP, in accordance with NIJ Standard 0101.04. (June 2001). It has a V50 of 610 m/s (2000 ft/s).