Comfortable helmet for work at height and rescue With its strong chinstrap, the VERTEX BEST helmet sets the standard in head protection for workers at height. Specifications: Head circumference: 53-63 cm Weight: 455 g Material(s): ABS, nylon, polycarbonate, high-strength polyester, polyethylene Certification(s): CE*, ANSI Z89.1-2009 type I classe E * Meets the requirements of the EN 397 and EN 12492 standards for impact protection. Meets the requirements of the EN 397 and EN 50365 standards for electrical insulation. Meets the optional requirements of the EN 397 standard for molten metal spray, lateral deformation and use in low temperatures.