Klein Tools Hard Hats are 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 optional Klein Headlamps attach securely -- no straps needed!PRODUCT FEATURES:- Tested up to 20kV, this Class E, Type 1 hard hat meets ANSI Z89.1-2014, CSA Z94.1-15; EN397:2012+A1:2012-Lateral Deformation (LD) standards - Patent-pending accessory mounts on front and back ensure Klein Headlamps attach securely and precisely, every time -- no straps or zip ties needed! - Unique suspension system features a flexible open frame design to provide optimal fit and improved air circulation - Breathable, padded sweat-wicking sweatband and top pad improve comfort and are machine washable - Easy, one-handed adjustment with large knob ratchet mechanism, even with gloves on, and soft neck pad pivots to clear bandanna knots and pony tails - Universal accessory slots on both sides for attaching hearing protection, face shield and more - Reverse donning: suspension can be switched to wear hard hat backwards - Klein Rechargeable Headlamp (56034), Alkaline Headlamp, Sweatband, Top Pad, Chin Strap and Suspension System also sold separately