Longfri light-weight ballistic helmets, made with PE fiber, meets NIJ Level IIIA standard and is designed to protect against fragments and ballistic threats. Light-weighted, less than 1.4kg or 3.1lbs Ergonomic design of the internal harness provides ultimate comfort Improved four-point retention system and sling suspension system for added comfort and stability Ballistic performance tested at NIJ Level IIIA Longfri Ballistic Helmet protects against: .44 mag and 9mm bullets Fragmentation ranges from V50 of 500-700m/s Imported PASGT Size Chart Medium - 22.0" - 22.5" Large - 22.8" - 23.2" NO REFUNDS OR EXCHANGES FOR BALLISTIC PRODUCTS.