HJC’s off-road helmet was designed with the purpose of creating ease and comfort for the rider, so that his or her focus can remain on the obstacles ahead. Subtle adjustments to the shell design can drastically improve visibility, ventilation, comfort and convenience, which are crucial factors for every rider. The i50 is DOT & ECE certified, achieving an extremely lightweight while maintaining superior shock absorption. In addition to shell design, the i50 features SLID (Sliding Layer Impact Distribution), HJC’s impact distribution technology, which can help to reduce rotational acceleration in an accident. Advanced Polycarbonate Composite Shell. Lightweight, superior fit and comfort using Advanced CAD Technology. Impact absorbing, multi-density EPS liner. Maximum range adjustable visor. SLID (Sliding Layer Impact Distribution), softens impact effectively and manages multidirectional shock. Large eye port for maximum visibility and superior goggle fit. Aerodynamic rear spoiler. ACS Advanced Channeling Ventilation System. Top and forehead intake vents combine with rear exit vents to provide flow-through ventilation that helps to pull heat and humidity up and out of the helmet's interior. SuperCool Interior Lining. More comfort in dirt and off-road conditions. Crown and cheek pads are removable and washable. Nylon Strap Double D-Ring Retention System. Neatly secures chin strap. Meets or exceeds DOT standards. For proper fit and size measure the circumference of your head 1 above your eyebrows and around the largest portion of the back of your head.