Portwest Expertbase Wheel Safety Helmet PS57 Our best seller Expertbase Safety Helmet is available with wheel ratchet adjustment size 55-62cm. High-density polypropylene shell, 4-point textile suspension harness. Soft sweatband is included. Spare parts are available. Product Features Unvented helmet shell for safe use with electrical applications Electrical insulation up to 1000Vac or 1500Vdc (EN 50365) 4-point textile suspension harness for enhanced wearer comfort and safety Size adjustable headband via wheel ratchet system Soft foam sweat band included Compatible with PW42 and PS42 clip-on ear muff Available in multiple colourways Electrical properties ( 440Vac) Compatible accessories available Up to 7 years lifetime from manufacturing date (as long as undamaged) Lateral deformation CE-CAT III CE certified UKCA marked Materials PP PE Woven Webbing Standards EN 397 -10&deg C / +50&deg C, LD, 440VAC EN 50365 Class:0 Please click on the size guide to check the Portwest workwear sizes.