Klein Tools Hard Hats were designed and engineered for optimal safety, comfort and fit. Unique features allow the user to comfortably work in a wide variety of applications and demanding environments. Patent-pending accessory mounts on front and back ensure Klein Headlamps attach securely without the need for straps!Features Tested up to 20kV Unique suspension system features a flexible open frame design to provide optimal fit and improved air circulation Easy, one-handed adjustment with large knob ratchet mechanism (even with gloves on), and soft neck pad pivots to clear bandana knots and pony tails Safety hard hat has patented accessory mounts on front and back ensure optional Klein Headlamps attach securely and precisely, every time — no straps or zip ties needed! Accessories and replacement parts (sold separately): Rechargeable Headlamps (Cat. Nos. 56049, 56048, 56062), Sweatband, Top Pad, Chin Strap, Suspension System (Cat. Nos. KHHSWTBND, KHHTOPPAD, KHHSTRP, KHHSPN) Universal accessory slots on both sides for attaching hearing protection, face shield and more This model includes Klein Rechargeable Headlamp/Work Light (Cat. No. 56062) with charging cable This Class E, Type 1 hard hat is tested up to 20kV and meets ANSI Z89.1-2014, CSA Z94.1-15; EN397:2012+A1:2012-5.2.4 (Lateral Deformation-LD); EN12492:2012-4.2.1.2, 4.2.1.3, 4.2.1.4 (Front/Back/Side impact) Breathable, padded sweat-wicking sweatband and top pad improve comfort and are machine washable WarningsRead, understand, and follow all instructions, cautions and warnings attached to and/or packed with all Hard Hats and Accessories before each use. Failure to follow these warnings and instructions may result in serious bodily injury or death. Electric Protection Voltage: Up to 20kV Class: Class E Type: Type 1 Lumens: Boost - 300; Spot/High - 215; Flood/Low - 100 Battery Life: Flood/Low Mode - 14 hr; Spot/High Mode - 9 hr; Boost Mode - 4 hr Bulb Type: LED Hat Size: 6.5 to 8 Overall Length: 12.5 in (31.8 cm) Overall Width: 10.7 in (27.2 cm) Overall Height: 6.5 in (16.5 cm) Weight: 0.9 lbs Suspension: 4-point Suspension Adjustment: Ratchet with Pivot Hat Style: Full Brim Accessory Slots: Front, Back, and Both Sides Material: PC/ABS Shell Color: White Shell Lining: Padded, Sweat-wicking, Odor Resistant; Machine Washable Venting: No Batteries: Lithium-Ion DownloadsSafety Data SheetSpec SheetVideo DownloadSafety Sheet 1InstructionsHH-Gen2_revINSTRUCTIONS_WEB_f2.22.pdf