The DAX Hard Hat line standard head size is (6 - 8); 52-64cm circumference, Fiber reinforced resin shell for superior impact protection, Perforated synthetic leather comfort dome with molded EVA foam insert for additional shock absorbing protection to the top of head, Oversized ratcheting fitment dial to adjust size, easy to grip and use with gloves on, Moisture-wicking foam backed microfiber liner reduces sweat build-up, 6 point suspension system for a secure, comfortable fit, Triple reinforced crown for superior impact protection, Designed to offer outstanding protection in hot and dangerous industries, the DAX Hard hat shell has been tested to radiant heat loads producing temperatures up to, but not exceeding, 350 F (177 C)Meets ANSI Z89.1-2014 Type 1 Class G standards, Imported,